Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cb31340a764d56…

MALICIOUS

PDF

110.9 KB Created: 2021-08-08 06:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86b85dfdbd9323d36292027d41d8f16e SHA-1: f8cd8b383fa1ea14618ef090e5a733d36e3c1403 SHA-256: 22cb31340a764d56d4ed70a3dad25e2e36560ee85904d40eb2982c5860e78026
154 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to malicious content or phishing pages. No scripts were extracted, but the structure strongly suggests a social engineering lure to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac121faf901---65910717336.pdf In PDF document text
    • http://aven.su/userfiles/file/ximoviriwil.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e9e7c921b7c8c33f5bd5ca57596900b7/9776904683.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2fd972aadf7ce9d6f8f1b8d5f3e640a8/nubaginemerotevan.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/35428491073.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/xagitozixanidisinipefe.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/87cm1rmf1le0foaofgsj24tupf/55155435100.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/wetulage.pdfIn PDF document text
    • http://akssert.com/userfiles/files/78430205170.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7641osigl0t57c2aaoc2ko8tdc/naxavitivejedaji.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/faxadasefuwiburaz.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3e1c49b47f72ab7d7e943474ef408206/meranegewelalobajana.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb3f301bfc---58955921726.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/82roo98q1fqgeragjtkfphs5ge/rusezuxudixuben.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5aa10f271---fizawoxufob.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/benumomugilusakanipuzi.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/17446202486.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/zoxebunab.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • http://consade.com/userfiles/file/kesodudemabaxeravezaxeliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=skyrim+mod+to+edit+npcPDF 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_off00019171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19171 17432 bytes
SHA-256: a2a2ce3752d1a74a42f345946e2289e822f934dd65b08777735b675b78df2aff

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