Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f0653088f5bba…

MALICIOUS

PDF

63.8 KB Created: 2021-06-08 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cde9e73b5159da0b2e6301ab2eca8400 SHA-1: a4ba476f4b922ef0f84b290fc8e6c35f9f3a5c4d SHA-256: 721f0653088f5bbadbfc6e190cb8f0d8e27071ad7319bb464b9bd4d2ea71f072
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9111

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 https://catamma.ru/uplcv?utm_term=how+to+program+my+suddenlink+remote+to+my+samsung+tv PDF link annotation
    • http://skiflogistics.ru/userfiles/file/lebudojuvibumowojav.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fadelulitoxugi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/669cc180f74448cbf88d79158bbb84f0/65263239445.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9b04a181209ceadd78681f00bf63ed3b/98682880141.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/7130d3b4b767b1104c26def9c5c8cd04/xetukemumetajexadara.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41db21804---75244939362.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705e37ebab0---bazerexo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1420ecd9c---faxijexewelezejepasadiki.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/735cd2b33774152b1f41b1444c6a08d2/wanaz.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9e507f3a74---voraluxamabisa.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4055857be3593bfec4ec32ba72f48f4c/gumukaraxidani.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab35244778---sofigorijaguj.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ae5df3a0---posunogonaf.pdfIn PDF document text
    • http://www.moyekolodin.com/files/52427973362.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210607172309.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27e21041c---rubetunij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 5560 bytes
SHA-256: 77c991284e2ca675823b67dc93746e8ee1f2f1b3eede90878c291a1c9078f86d
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 9880 bytes
SHA-256: 43030755d49bd7d62bad98895b37f51d982e13b98df4a731f62adcf794745c7a

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