Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d0e1ef56759dea…

MALICIOUS

PDF

108.7 KB Created: 2021-07-07 17:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81ea791cc173b2a61a375e06e192ee77 SHA-1: 778a6c11f377ff8730b868d10ceb15a31120eaa5 SHA-256: b1d0e1ef56759dea40169be615548a7ab323f2b897d5eb46ba3762d122d28e02
316 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating malicious intent, including links to compromised WordPress sites and a high ML classifier score. It also employs social engineering tactics like 'ClickFix' and 'Clipboard Command Lure', instructing the user to execute commands directly, likely to download and run a secondary payload. The presence of numerous external URLs, many pointing to disposable hosting or compromised CMS uploads, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hasyo.net/files/file/1420737923.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0f70knhmu00utvcjg8r1j8dfb3/82251805102.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d54c95c1---85521942364.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/31317451413.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c84372d74d7d5be3452ddc8339a9f191/kesedobafujububolo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/33p3ts65r46l3i5ol9tf2u980n/41019876823.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/5snjool3lne33vjd0q7s4l5gjnteus6k/54718113346.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc8f92f095f0cdb28ed6c9a9ede9d376/48896123711.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d67dad91---xirebojudowisagimanu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3mt23h3pmb2gfitb3sha6ka8p4/52356868280.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1lt64brkkeraql25lv3i4u7i73/47067504266.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/bovebuxotunizoxagun.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/79f5f61b23bb58e55c28afb0e93fd3ea/81897940510.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/13045684323.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/32912703edc282aa421e115e3d4e2518/kepanowowolapenujuniwixat.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1487c1fced97e1dd17fe966997692af6/96164557316.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zizakitexitetevixera.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/46871883877.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/kajagawugolufevoniraxutob.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/31820566834.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u2vqijie697s3crahcdcks5eo6/29743639268.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rgm2itdl7knriksmodkmpfjtp3/43480725262.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7fd13efb---xuzalijapoxovazesoluxavub.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/13467925712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kmspico+download+for+officePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF2 17544 bytes
SHA-256: 3909874c49a932e6e75ac0d8a5d0dea9f7ef95c34489a4303fbdc018a3711c0c
font_02_sfnt_off00018cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD4 10760 bytes
SHA-256: 2e29c2faceac156c49168b1227a80925af660cb9817913a24d381e0c2c1c21d8

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