Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea72916e4a9d633f…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 21:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d7544c673438bdbca30180e8b3ca37e SHA-1: 8c5796b886c0640fff77805e16d6024779e1aa09 SHA-256: ea72916e4a9d633f08c29e69b913be1e1f8022edf0712850787d7e036d59cbaa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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 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 https://irlanc.ru/uplcv?utm_term=comment+signer+%C3%A9lectroniquement+pdf PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad108b46bd---rinavu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/rewovuligagalutebav.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045b9e6586---tofasebekabosolad.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kodemajezivorev.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160762f88d150d---rofilufofubowolasix.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5242166027---76928923329.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/77441460210.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/9nsslr37mtrmu39d6altagkquh/10185640530.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/lujogufi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/98302737418.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763946488e0---3209651136.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/5367jmr8ufiqa13oj3lnilge86/dikapukafop.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/fobov.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/24450324275.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/razuwovezojakobumuwakafo.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/79092885255.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/39a8e33fc1abfad912c86b6470815512/finuzavex.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/jipovufazupawozatefovutij.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/75761798532.pdfIn PDF document text
    • https://sealskinz.ru/files/file/56037299713.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/21068033107.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160726be536f0d---54608183484.pdfIn PDF document text
    • 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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 11232 bytes
SHA-256: 8d16cb67c9f00fd9a7f89dc8354952faeecfcfa3156d1e65b8f85b7a0a00e1ab
font_01_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 20880 bytes
SHA-256: 951ab207354c2580621faf110fe45dc4183fcd4b2a0877b675b5be3e242305b1
font_02_sfnt_off000144c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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