Malicious PDF — malware analysis report

Static analysis result for SHA-256 566c9c739a40ecc4…

MALICIOUS

PDF

70.6 KB Created: 2021-05-06 22:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037e8a2f5443de77acf4be9c74968bb2 SHA-1: 68579f831d4535f9d44a945114ef7ba62df4413e SHA-256: 566c9c739a40ecc4e1ee225fc714f478ceb37a5dfb1f50f70e71acf46e4def81
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=year+1+maths+time+worksheets
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4f7455523d3e24c6fd6027c8b0305bee/45774298881.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608dacea65cc7---jefexekoxiraxa.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5751a318457dea9bbc346279df4eef86/xolofuvikubawifek.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbb40e06a---94301262061.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/af1962b7af9cfb503692ed47a6d44479/65402207873.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca752cc4f6---44741687210.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf94920f3---44412061994.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160731ca108c87---nolurado.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/majinaseda.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/52ohvf05n26unie0mj00uaaca6/didinepedejoxetuwitorutug.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b181be6ea---45909983908.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160817a25ac04b---nozuvonukazubemesuzelo.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6lj5ipcrm9bje4e428pchtesb1/lebugewavuzumiwu.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079de23b020d---94444813535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ff.bin
2d299484584235cb0e863dea2577c79edec25c70f5102b928434d4c3c8d188d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 5064 bytes
font_01_sfnt_off0000f324.bin
5b816385d4617ac6dfaa52be78189543fbe1139ce9d25633f70289eac4333703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10508 bytes

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