Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfd4b02e10c45ea…

MALICIOUS

PDF

74.5 KB Created: 2021-05-10 19:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a724c51e177544cf1066eec4b02a5b16 SHA-1: 952482a88f87a0dfadadeea076eaeceffae8f0aa SHA-256: 5bfd4b02e10c45ea82c6a8c85ceb5c2e8bd986bc885b1fbf144c9f13f061313b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or distribute malicious content. The presence of external URIs and the structure of the document, despite the garbled body text, point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0ed8e595---paxevofana.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d7490392---7358772019.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609076261c80f---79834417792.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/iav48tq9u7r6n7psejntr17qh6/gotitenovasalufar.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cs5jmhj47lh3alfddtgan880hb/46221068099.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/80a69db7a5bd0360db46cfc7f152b2ce/80979672280.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e74dc6535---47016706537.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5eb47c23a477366c3ed2dec8579a362c/12894941018.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9a98f41fa9a81f80b841364e68066ef6/rivewesogoj.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b703099d3c00bf65d23c6733bc646883/vedizalosavapaju.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/910a2ea52b163cfb001840dced42d420/95309517863.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce719659cd---29227225328.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ksocu0g1mte9bmteelv96kfj3p/6243824786.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1279962c---baribadawu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b5822d33---gesexivadewufabe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fe12dc8d9---62079105493.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/085ddcce744864817a67a02ebb36c12f/jimuxovelunim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=structure+of+a+formal+letter+uk
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb3.bin
9946a91a939370acb7e30790aca61dfda8edbf9bb22731b199210039c74e6413		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 5016 bytes

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