Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5d28164f27f561…

MALICIOUS

PDF

88.0 KB Created: 2021-07-06 13:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746df9bf17fd9a9fa02313cc4e0765a7 SHA-1: 285f01d583f99f77532ff0510cda95b30cc7c380 SHA-256: da5d28164f27f56139e2367a4f36f489d8341e19c3473faae2139a8c4b394494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links suggests potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://multi-accueil.fr/ressource/site-image/files/jopuzuwukaw.pdf
    • http://nicenpos.com/userData/board/file/xepanak.pdf
    • http://fletcherfamilyreunion.org/clients/52745/File/35111668638.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/80369138754.pdf
    • https://sarvodayasamaj.uk/upload/files/xigofimakurele.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607629c960793---27500377438.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7659fd8260---89424405002.pdf
    • http://abpaluso.com/upload/file/bikagirawijoruwaxoruzod.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874d74318eb---jalapu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mk3skpb1bgtjaim1qfmpu8qf0r/84990549938.pdf
    • http://matstravel.ru/userfiles/file/dekanidudusepafobatod.pdf
    • https://daismene.it/file/88773690498.pdf
    • https://giasusinhvien.net/upload/files/4788653584.pdf
    • http://hondatayho.vn/images/ckeditor/files/67782698592.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8mdmi86m7o0u8jqk8i8hbv91f5/78634875346.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1ed99148b0ede5274aafbcbfe1aeaed7/79542823331.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/99d7e5fa7037158eeb85b865b2b157be/zamobulojedixanerefavor.pdf
    • https://hbphoto.ca/resimler/files/59834777434.pdf
    • http://blevy.com/ckfinder/userfiles/files/pozubonut.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb3b14022---58401693839.pdf
    • http://galluccifaibano.com/userfiles/file/39890725102.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b918bdb30bb---vefaxele.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=i+am+unable+to+attend+the+meeting+due+to
    • 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_off0000f593.bin
28de0c296840d606b7c2b041e21d3822d48ca42ef67decf05392c868bd58a074
pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17408 bytes
font_01_sfnt_off000122c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16792 bytes
font_02_sfnt_off00013ad8.bin
89cbb6534e037d9a5e0e1f89b31ae0971eb0a17c10676cd8de77de9e46e45096
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 10620 bytes