Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf73f5772670d9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 10:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c6bbd8c2a9cd66e4cd3e9c2459909eb SHA-1: 269082b98a24c86bb8698e11c27d29e9be682fd2 SHA-256: 83bf73f5772670d9e2c469342ea4e7f99d70bad51db22a79fa92817e0ee8f396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=geronimo+stilton+books+online+pdf PDF link annotation
    • http://refinerlink.com/userfiles/file/rogakug.pdfIn PDF document text
    • https://stauber.lt/images/files/38381459776.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/76403502261.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161483069dd3f3---zotogolugipur.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/80135195548.pdfIn PDF document text
    • http://nktrading.qa/file/files/98337203737.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/32386280997.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb72a050e7---29247964943.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kerogodanevarana.pdfIn PDF document text
    • http://hidramaco.com/files/files/91458890119.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/19408998719.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57306921031.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/83733983203.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/28082505068.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5d8ac4ea6897ec6fb4b11f44eb06aeb/90583740656.pdfIn PDF document text
    • http://topas.lt/userfiles/file/90735705043.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/94928347269.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/girexamanepo.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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 18256 bytes
SHA-256: 830838f3ad0e828625dc6caa0ecb8963fab75e193af80f06246a199a3198ea24
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 10768 bytes
SHA-256: 791bbe79340e9d5ecb9012339c1b54e98cde1be01965783d03a55a03fb6c78b1

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