Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faa61e4b43df66c…

MALICIOUS

PDF

87.3 KB Created: 2021-08-12 17:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b19d8fa14a1d1fd8f94d0f185e145682 SHA-1: 435ca2f0f71fe8e0bcc4870eb6de0e4b3ef44c63 SHA-256: 1faa61e4b43df66c416d843aeb2a4428bb3e32a139be3dd6989b040c722ae794
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://dgjinhak.kr/DATA/upload/files/202107260402254029.pdf In PDF document text
    • http://skazka76.ru/pic/userfile/kuzudedewuk.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160927af6e6a74---lujok.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/valebozetavidex.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d080529132---41825911275.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/ruredujezolelakenokedav.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zupapuxar.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace13b3ad1---tozepi.pdfIn PDF document text
    • http://corporacionnoa.com/UserFiles/file/ravolaxetuzenatusate.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/bepajizexakipotijufe.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210804005028.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/55694527099.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210610_B2293BA46E8E653B.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a1cc62ab57f9425b827699d427d0ff3f/99132356228.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d73ad9c6425f5f2e2ed321e963047975/63828975394.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/22828048346.pdfIn PDF document text
    • http://expresskaliski.info/file/litixovojurorinubajodu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160dd68451e4b6---4571032888.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/zijip.pdfIn PDF document text
    • https://luminex.pl/upload/file/95439772814.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/bibux.pdfIn PDF document text
    • https://wecareprogram.org/images/file/3264046823.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dd2758eb7bce8394aa28bc092e220c8d/puxalobolubax.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b97c0209---diditizukok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+word+search+answer+keyPDF 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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 10756 bytes
SHA-256: e671a8df39aa1e8248829ea99d40002b95528eaaf2a971cf9848dda8b3ce125b
font_01_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 17788 bytes
SHA-256: e28585cb614b285f6c1ad31c77ba325f928aba8f7cdc9c19c494a2d6b5bc4476
font_02_sfnt_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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