Malicious PDF — malware analysis report

Static analysis result for SHA-256 85600dc7b1e300f6…

MALICIOUS

PDF

68.1 KB Created: 2021-05-22 01:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aba1247aca42c8160d7136eb2354b1d5 SHA-1: f64fc4b640a9e95a027bd7f7c16cd28ce7448517 SHA-256: 85600dc7b1e300f61ca3c89a351261beff127394c562f0ab3e1698a913c8ebf9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the presence of numerous embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • 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
  • 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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae3224e1---50960013548.pdf
    • https://topinsolventa.ro/userfiles/file/foxolefosela.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdc89083f---zilevanevalekoripipadumu.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c9dd4e3272fb5da4ad7bfefbede71771/situxozuletepedeb.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/536653e22ea386b55cba88b8efb109e6/49418314927.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2469d5be3c3a062796670bba3b018eb4/lakuxafisugebu.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8384c540f7---zelojojimalik.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/dvhi0kh3m3eqd1ioep9vtuvd93/50060615326.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160988964cc908---43170046083.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609243fa2c966---fesek.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510a240a86---11576954658.pdf
    • http://bhk-aindling.com/userfiles/files/20712973716.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6982c61a50d557fdc70d8a50ed3df39f/dekotuzikutef.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aff82696---25896034164.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6n2e28ucjp6pvl0sg7u48qtj20/49819014113.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab1dc6451---daguvawusofewajoxateg.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a306322c5---besufomawodaxoxorujeruwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=maximum+ride+read+online+free
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd37.bin
cebae01994c3ac23b89c89b5b03f03de5367f82d4602dfa18fb6bb31ea0a0182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 4948 bytes
font_01_sfnt_off0000ee07.bin
6c6b267b57a73ad08139ad1f321c5dd534afacd25f70b32e603c3d3a0f2f4fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10852 bytes

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