Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f66a626624b223…

MALICIOUS

PDF

80.0 KB Created: 2021-07-30 11:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59865752f30292e95d8c54cfa665f162 SHA-1: 369c6fa4819ddca8a0d77718ade7b46558852acc SHA-256: f6f66a626624b2235ad1cb055b7c574ed9ea5eb948c066510a43c0c5bcd83860
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9424

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://formpart.com/upload/ckfinder/files/86575933517.pdf In PDF document text
    • http://armanetti.com/images/15655724882.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9700a97a2---7611557483.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c572ea3c8b1---263296608.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/587b9bd030dec4af1c08acaeadaab55c/63457402529.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/481b053fe76e7b5b1cc6111c3017f6e7/76261989001.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/61e13babcf624aa12ce47910c2cd3949/13752917449.pdfIn PDF document text
    • https://path.mn/userfiles/files/xidopuxozakuwopa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/woxowaleto.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/12639359876.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g8v3t0t99n5qv4gnvqqeoi7l2t/10002623847.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c407a2dbea---25107894166.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/aaee30a11bd6613e44b8706ce9ab4a2b/76830217643.pdfIn PDF document text
    • https://kuepancong.com/contents//files/zununijozu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/folokotatemokakijebezir.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/1092860376.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3ba3d0f0---zebalis.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/tovixuvepivepinigagewezub.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/30055087360.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7715132fe---domuzaxux.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/a159bae3aff3321a83801e37073d751c/tupedo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171698ac7c---27656589377.pdfIn PDF document text
    • http://polkovnik.su/upload/file/43811134936.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a83501ca1dc585401c0674711f27602/46067160420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hp+chromebook+14+g1+14+celeron+2955u+4+gb+ram+16+gbPDF 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_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 17428 bytes
SHA-256: 4401c5affaf4cab57f973efa65ea724d5c1cdb8a39a777a3fe6429018d16ac83

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