Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ba3206ff4658cd…

MALICIOUS

PDF

66.2 KB Created: 2021-06-22 14:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 82810a0376128737da361b943a70e8e9 SHA-1: c2de88c7f9e146e3d381e1b192ab10da455e57e9 SHA-256: a8ba3206ff4658cd3a412d6c2dc3cce7be544fcc864473186a670c1590a871d3
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ba70e99f1215a742bfa6addb903fddee/xonuwadogasu.pdf In PDF document text
    • https://anctools.com/ckfinder/userfiles/files/79804707998.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7cdb216acd061758d7b57378206145ef/nazuwipozo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9f6491ba8---gevin.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5b4032b62b076c2abb4a47fb4652099c/jugelipegomajid.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t1c1c4lfh06i005oc0vhhu9rm0/30437690615.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/a444fac0b97ecfdf1bc828a135701cd3/fazozovevixofoga.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee184f439---kalemedudisusufidawekufe.pdfIn PDF document text
    • http://thedreams.cz/files/87426023397.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/018f0d5498010b83f25da6ae5379c894/tujuvafevusopizisukobiran.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7392192b---28314948443.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd436027---sekufowonaget.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902457d909c---73334061455.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb894ff72---fiwolaretireli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+difference+between+ultra+hd+and+hdrPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 5356 bytes
SHA-256: 16e8f626a7accfd879fbfb00c2aba0e0815f4338d9461337cafbc1a49f2e76b5

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