Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a79d53ecbfdd0dd…

MALICIOUS

PDF

66.8 KB Created: 2021-08-15 10:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6a8cac680ba60f1132a80e3cd64b616 SHA-1: 731141bae729c3e331f4ab0a70f095025ce83652 SHA-256: 4a79d53ecbfdd0dd0f156c0ab33b9af23433867039b834d3d2f399fc1a43017e
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9431

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://baldonimarcostudio.eu/userfiles/files/gilipup.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd524c7c63---41409472691.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/1kfqs6jogau7guqt0frni8l1ji/56652896344.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/vupugodugupobanubi.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pepowopulisemupenalu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021517819384533.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b604823d49d4d1d19cdc279a35425f9c/40783088541.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/73e2ef70e857b497d39220e53fc42508/nakoluxijuk.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088172b3050c---55970029325.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/74833730006.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b8c516d5---gomuvoku.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca20fb2820---55662046649.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed95a4b7f58---lugobor.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/73a8ec74781624781859703f66b7d3ed/wozuxokaxuwatepemijoza.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lidafuzonug.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6298c72e6---tedadamekofeniperun.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/tofixizikuvatavifipo.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6bea32b85011af3990d751324c0cbd04/30332352209.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976d2c15fb---titikipom.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/52600827668.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/869354703964d1f61278666e6685a6fc/5529914385.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/45543679123.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3efcad94---lelotejewamobaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+scarlet+ibis+foreshadowing+quotesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 16124 bytes
SHA-256: cfe609ae936e69011d1874303837e7a3ff847a33bc768644882218405312b74b

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