Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e4085854c51269…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 23:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2eae133ce0b5ae1da77de0f877bd97d SHA-1: 7c89408ad6502bbb93cb0651d45f366b21a4c379 SHA-256: c2e4085854c512691ec79cccc3e7d4dff6183fb494ab79d78093dea43df2c86b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d0de467d---vaxogafowisuvuwenos.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2866b4c07---dobutijugumagazajomej.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ojr2t6hl0evq9sl6dms7g3he3s/1941145863.pdf
    • http://szwygs.com/upload/63798947559.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/489b8fcd6eb887a99e47e938dd318681/gixesagofufuvutebot.pdf
    • https://aduanaldelvalle.mx/userfiles/file/silemel.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b44bb585d---37567931011.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/alahr416cdn6092gehanjsp00p/68293349977.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3729dc1205ade2ce874d126daa68ddb4/deroro.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9789f8703f---33308477479.pdf
    • https://foundryindia.org/userfiles/file/xizidewedejepo.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/50f0c5ea686e450b93e8c0ae31fcdc90/busuvisiluguvuxavup.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083db5ef2025---29993754103.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a53bffb1794---98033705677.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160722cc90288c---70740074197.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23684859cf---tuxanozusomegog.pdf
    • https://24emk.ru/ckfinder/userfiles/files/33914377780.pdf
    • https://kindeeyudee.com/ck_files/files/warufofutemobogukusefe.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a8f6f12bc6d7317b9e3b2a1a0bfbfc3d/nigodujawero.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/59261837797.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/94084124456.pdf
    • http://alhouti.com/userfiles/file/80871398062.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfebc8dc649---vowosatipidib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=game+of+thrones+conquest+building+guide
    • 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_off0000ed33.bin
4ed72a88e9d86a38ce17bedd04da96e27b1324e7a067ddf474487dcd53875ccc
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16996 bytes
font_01_sfnt_off0001191d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 16792 bytes
font_02_sfnt_off00013134.bin
e80d1c3888c51688174c83f90f5f0b249e178607dbe9eb0db7a058068139b36b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 11348 bytes