Malicious PDF — malware analysis report

Static analysis result for SHA-256 c737c8bbe5f102e2…

MALICIOUS

PDF

64.0 KB Created: 2021-05-13 09:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cfbd9cffea3a2e7c7b439c4ec6426c0 SHA-1: bf8b98b473d7298376300f828ab3281581db506e SHA-256: c737c8bbe5f102e21869b01ff191c7195df7995acf51472169b72b9aadb6aa5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards a tactic of using compromised infrastructure to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=google+analytics+android+tutorial
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844801ec58c---76151028673.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe3hpbfb0f8v1fgjlo9p4rev8m/zenimexenesomitobelam.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mt3ho6gdeil9nioeln4i3uepn1/maxebewawot.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/40ukc1vqgb1t4k5f5evcctvbrs/rejivema.pdf
    • http://adria-ex.com/images/blog//file/jarukudulelidin.pdf
    • https://noddy.nu/images/file/zatovobotebarobunimenik.pdf
    • https://alnahamgroup.com/userfiles/file/xiremufegabozojuxo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e9b939e2---55237370675.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4d44894e---tivimebimid.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/505f84f8ff2f2ae9c33a48d3f32164d7/febivunupexoluzo.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9280b3a1---mixowuduzonarujolipavil.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea4113d0f---82025228111.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092da9388814---75153580257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca04.bin
0ffafda3f669c1afa9813491a8a95153ccb9caf312e3ab75f7918a520a0009bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 5240 bytes
font_01_sfnt_off0000dbf1.bin
1dfbf3dc32d4e60a57acce7831d5fd90de70fceb7d7c4d47655d6b67e62b96ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 11504 bytes

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