Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67ec7bfc3580ccb…

MALICIOUS

PDF

84.6 KB Created: 2021-06-08 10:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e9fa71b04578c32748710ed1b637cd22 SHA-1: 252595f378e56161549f4199020b46a246651e8b SHA-256: a67ec7bfc3580ccbd282f15e0ea9297ee47637a6b56e9e1fbe6d8c51ff69c8f9
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 0.9481

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://nomylo.ru/uplcv?utm_term=resnick+halliday+physics+volume+1+pdf+solutions PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6366cb9d3---2049633246.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/89034983339.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021060619441444.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/37319749634.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b152c0cd6---18758071196.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qbp04eh5odso8a3t47pbijnjj9/65621934298.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ccf081bc---rumifusezewevex.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160add0ce6bad7---fugifod.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7fab8ce01bac1bcb31761e3a10b91864/fodisezuzaredo.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/xuzaka.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/991acbe3d7a59d72e1b1dc755a312f71/20047421979.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5cb0ab934---13361842942.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160769b4c23c04---zofem.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/21639108816.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738830a49a0---91623459312.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/9vs744k4i28ia088q8td82efa5/vibevakewuwaguweferuka.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/78j1nivo8lm9hnfccqbmi5je0e/18174886253.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a170c91bb13---xoparonazepazuzozenoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 5468 bytes
SHA-256: 9d2139f3f4ee13bc0a87050d6844a82fc8fa7a847a528083f64190fedac29ba9
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 12832 bytes
SHA-256: fbb97758478ddd007051248715dd2ba022a57b5516cf5ca0c717cb94966697c8
font_02_sfnt_off000148d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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