Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2539c628ef6621…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 20:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c096c7db05c76251a6d96d709b0386f SHA-1: de4be9f244e08c520f8167beba1992283aaea77e SHA-256: 9d2539c628ef6621d7fa46ae200107e2a20b3d29bc3af3141cc7dc5e05c1370b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or spam distribution scheme. No scripts were extracted, but the PDF structure itself is designed to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crewmak.ru/uplcv?utm_term=garrard+990b+turntable+service+manual PDF link annotation
    • https://anandamsanyal.com/userfiles/file/77073151078.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/76606172951.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/noravumaxatiteve.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/domoxopavowatexomokusev.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/90373354682.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qa019mik2norlaiq2q6pk0r8a5/7891460105.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/nezizovebizuguwivef.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/96636232092.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67325f3dc---52167639725.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jegefixitadimiz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d2e3e53d8f7f5540e80d80fa4f9161d8/28031148177.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99db427ab302a39d1f45980cee5bb83e/buxukufu.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/butegewigajexunurapun.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02e6d40a9775f2104820a02ddf49d7e8/kizupisepugufofexemuva.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/75384078273.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/19925649241.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e932884c---wofasagojozukexulafudis.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/soxobebuvifinamuredor.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/11311512813.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a690d47f---vakafatibelugapaga.pdfIn PDF document text
    • https://ibextrail.com/editor-images/51660558301.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116454eca4b6---25460259781.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160769d8226424---60894713571.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8m3rcuarn0pod20ccvumjei46p/sakadab.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/95201339401.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 18208 bytes
SHA-256: 98f393c9a6e2dda1c581738305b7a7362959114b645e1dffaf1f4d355ada03d8
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 11044 bytes
SHA-256: 2469367ec82f48f6f08e2ddd22ba6263d5e333704dcf961ab74c350141e214b0

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