Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9ad6aac91d6e40…

MALICIOUS

PDF

66.6 KB Created: 2021-06-25 05:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f59d38a52d55d4f33f76a79748f5d4db SHA-1: f920a71ccf861d8c65dab40095c75403627ac82d SHA-256: 4d9ad6aac91d6e4042d5036e8d6433353af59fc6c9f455a8529fa765b9dd5805
154 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 0.8630

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://garglob.ru/uplcv?utm_term=murex+training+pdf PDF link annotation
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7741df72f057ed7e5b4bb0c56f7d4726/59871730355.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964cb9a8747---vebabu.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/rizixokixojejafiji.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/24260980487.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/rudidobaduvudogojez.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210620100542.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/96648644937.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hse2p72cad22gh1hns8m8uvhu4/wegezigozesapumok.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3a0683886e3b5540cc8e9232c6676c44/gazedupeg.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b20f5b77e---zepafe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867d7f72b44---67335046239.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nkbro9tkqm5nskmspavtmetgh3/53576480766.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lllni1sald3brv13c3qdedb081/93615439138.pdfIn PDF document text
    • http://orrizon.ru/images/file/kutozonej.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v3dibup9aa9777jmht0lmo412b/27723164980.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49c746261---28396844774.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2254ddbe4---66674288717.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 5072 bytes
SHA-256: 3064f7de9393fa2bd9cb966f5bc4ae0215a6a85e657ee80ada7739239c3cac2f

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