Malicious PDF — malware analysis report

Static analysis result for SHA-256 312987abcf264d17…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 18:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55ea1601135e43c777170e1965976cc7 SHA-1: 113d322be3fa519483b02bbf3839f47a7af982f1 SHA-256: 312987abcf264d17ed4f90cd1baeb67aa961e525c2fbc90078fad0290b2d3ce0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/99utb83vpgkhseprtotq4gnqra/21167024150.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/32a720392a6bf9f7449c50535a714fcc/kitulu.pdf
    • http://vivaibonomo.it/userfiles/files/kiwujisilozemixesofepe.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9qvddc8t5p2ipn40j2djt8jqh1/41442754546.pdf
    • http://canadanur.com/resimler/files/kezonowowif.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e39da6a04777e9607002141532a2f8a1/4869605333.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba69359ab9e---roxepodezazumipiwa.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/33891646774.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/003749fce917d73d0107ff15f02c3d54/65037039493.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6f55748066907969b4aa039e322436a/kejubokozutedutazokipi.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5cc895d1b---24408839304.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a4d7f3a9af78ba2776c9368cf85ec50c/93571378055.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5dff62dd7949b8ddef0e952423309c3d/ralerefopixixavajuk.pdf
    • http://lycee-elm.org/userfiles/file/miwomiviwamowo.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8b049c773b525812fe4d0057f32b1d9d/85442934890.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gf2br0c1daduev1gjd3bqkca47/45795405844.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609763de3136c---10908731629.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/71f6irfs8i0psh61usg3f3q0jh/3880505194.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fcd6ccd7a551b83408c6ce87cd1a1292/16578212609.pdf
    • http://anhbanglaw.com/userfiles/file/87778710545.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/afe2d1bea5c80d9174ae58ccf919d610/23515111462.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f7a8443fb---17280848565.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/81279267363.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/052ebf3f9c713a3f6d50f7104dcfd063/48502373033.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d86f1f339---17875015539.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hypothermia+spinal+cord+injury
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001056a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 16792 bytes
font_01_sfnt_off00011d7c.bin
6c0f2594603c1f6da8e9bd826451b7907ab0e148b3c69d89d6418e31f5e11223
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 18628 bytes
font_02_sfnt_off00014e74.bin
dd08fa33fbf78a2200f3c92f2e2c420c8a592790a59abf6ea10c4a4dc4fcbf2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E74 11116 bytes