Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28583fc38fc4756…

MALICIOUS

PDF

67.9 KB Created: 2021-06-07 21:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5574ef4446f1c461c7e663dd3cc40b1 SHA-1: b9e9b6bd0f091f9100edf26f300f312d719df637 SHA-256: f28583fc38fc475693a5d78488d7c66a48f77a38c384f6536e50b0e06e9a9c43
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=what+does+the+angels+symbols+mean PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac165d8a808---74232723047.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/64342214376.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160895db2eb7af---21425694760.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/csl8uafr7l9a10pv2ndovbe7ui/79233299467.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/31220916601.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/vazipixaxefesulijixenu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/vowafofowajev.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/52439770280.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fe044c15---78537198798.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee171352c---zagativekivuko.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p4732m6h5tohe3cjimk2bo6adv/89048031621.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1b490393---90645187063.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/82790185329.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b5d8020a81a1002541889d8ea82d7c35/16950210643.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xedirivotudix.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/70719396019.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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 5396 bytes
SHA-256: 2086b74ee4227ed8c77031006f7df286db7c10a8e6066cde0c1c21e8ec01f33f
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 10968 bytes
SHA-256: 69e2cb23727550157dec9f3848a3f20c541446ba3912d1d508a219977aa5d9aa

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