Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a097e1a715b830…

MALICIOUS

PDF

64.0 KB Created: 2021-05-22 22:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5012e9ef721d787903ef3090911f692 SHA-1: 2cbfb88fd04dc281e90b8e9da9a7a4aa91d9eb71 SHA-256: 91a097e1a715b830d659d8f72d5c861c18c81fd2d20cdd57625974b04d24e6b0
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i9er9kmotv88s0c7jarfrljk18/lokimi.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607550a90df99---nelone.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/50qv3ojp89u7veheq43ih5vbn3/33841635578.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdca582b7---tefulezur.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9e05116f---lumulefopitoralazi.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cada2b8af---nedam.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/aa7oen279992cllb0gohovne62/98324455825.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99f17b434ca42363238da4d3698d6f85/dizibomerijifexefevesor.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/d1sho2j4ppppdibbls8picc0ir/10610781919.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608620c0c25de---vilolovuzijaw.pdf
    • http://afgventuregroup.com/cfiles/file/36406477800.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a8a2852c06309032e43a673a3674d630/64392283919.pdf
    • http://www.ecvbrass.ch/user/web/file/nupigalu.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1fae2b72f7ff84d07e59864ca731846c/pudetiwoti.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/17ceb460a3d04d875e93747172b15e1a/fefakipij.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ec84f136d12a31cf187d5fa6d34dcc5/2885478400.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca3cafeb8ef064108770364885276efe/3605404211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cosatto+hawaii+cot+instructions
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f4.bin
2fcd61ff6e9975fd2385f67d48c1ff6a080599d06f4a61881b3081205fd82c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 4852 bytes

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