Malicious PDF — malware analysis report

Static analysis result for SHA-256 639402f63836877a…

MALICIOUS

PDF

127.6 KB Created: 2021-09-07 21:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5b5a7cc7fbcec74e0d131e5e7e52e80 SHA-1: 8c949e6e9c928d2c788847a5522c7bde47864956 SHA-256: 639402f63836877a88d9cdb179037e41409b0da294cb39de0d6c52ae79aca8f0
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7885

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 http://sakesushilakehavasu.com/uploads/files/84940807349.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325252f695---90260891344.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///dusuvilo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xubunozasuweg.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/18091977023.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7c92faba---26167191671.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/998821509.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b78f32c157be2bbcf29418734acbf7fc/dudidaxulewazuxud.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/h4v0s99au57slgd4ppb78a9lnh/wetamelomamiguxu.pdfIn PDF document text
    • http://baove247.org/upload/files/88587837872.pdfIn PDF document text
    • http://aquatherm-graz.at/files/tetonu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/1377745461.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/nomoliku.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff53f3d59---86677263755.pdfIn PDF document text
    • http://goldia.cz/data/file/3181683538.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86b99d3ee---16380378330.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/fepimaf.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/87989216896.pdfIn PDF document text
    • https://ksboutlet.com/file/files/30077175565.pdfIn PDF document text
    • http://proxima-design.cz/files/file/94946419284.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/waxonuj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ee298c7f518---40208438336.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/fajuperutazojolowokalozu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/33299902489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=waste+land+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B666 10524 bytes
SHA-256: fa74114474da15854c2f3c1db2d375e6c9cc149b224e2eea32e6b8f3298c82d7
font_01_sfnt_off0001ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE4E 19580 bytes
SHA-256: 69faec1a597c649a66b9ba04134a35a7c7d610d2009b5b26364838e691c6fa24