Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5942af1a487f569…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e294812d338c453db4220e145eba67 SHA-1: 9ab2c24ae3ebe39222695e9310cdda786249ee4d SHA-256: f5942af1a487f5690fcc3032aa8db3ebacd2b314db039bb60d48217d175fd29d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Clipboard command execution lure' heuristic suggests the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads. Several URLs hosted on compromised CMS platforms were extracted, likely serving as download locations for these payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fd0886c0---gugejerakafotatujukop.pdf
    • http://tgtech-auto.com/userfiles/file/63788003224.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/00e6852008afdcc71a6d98ba035250ae/18407111510.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d9b60a9e7e300154735e5cacf6f92147/12389226225.pdf
    • http://dent-pro.cz/pic/file/69354843440.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080f78d6187c---10551343547.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160828c7e04ece---90770476231.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iufrkobppepvs5bs9meu4dm5od/22517543908.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/mlcu6s3r2b96coq6tspe79rhb6/31063682447.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/kevorezaxovezitovo.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d368e6a0c3---wutivonovoz.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c66d495e2707201f15713418f61c1e37/13400593952.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/c27g6d3n26ae6nhpulpl54rinj/92315907811.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/b8bm3itogaijmpe8vhn4oid1j1/zisaxipesusob.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0ed512c1---munawele.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1bbb8a74ff85cf4f26134af1e79dcd5c/69544615773.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971507676cc---gurasosegosof.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad0f7c08c---60277901440.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+start+winpcap+driver+manually
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010427.bin
58d566513ad72d5342b1fa454366a3f2643df55535b94a5b18d1fe5650bed7b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 5432 bytes
font_01_sfnt_off000116a3.bin
aec09146cf65879f6e99ba859af651f3fb2c65b5a3b58e2e338441b16dd8afc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 11960 bytes