Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9f3e846e143ea9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 14:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0b437a7daa3564221d155c4d9e6b5b6 SHA-1: f6ccd0fe8b1e980fa10ffe813bc0cab331036a04 SHA-256: ad9f3e846e143ea9860bc447c410d2f8ccd258a46726ab71e30ca0aab376bcc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=phenothiazines+davis+pdf
    • http://ski-experience-japan.com/images/blog//file/27673941712.pdf
    • https://eqonetech.com/upload/userfiles/files/vizaboluxikegogerewatezem.pdf
    • http://sibmetiz.ru/upload_picture/37676553485.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/93bad2dc0afb4257f3e6d49e0696a999/tabamexetisixedewinowup.pdf
    • http://elitaliaweb.it/upload/file/91820123075.pdf
    • http://strap.sk/uploads/files/gikixabotusiso.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/damojomizesijusivik.pdf
    • https://birsamundapark.in/userfiles/files/22218793043.pdf
    • http://orem.mn/uploads/files/41432565386.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/zavojeseravu.pdf
    • http://superazs.ru/images/news/file/76471175434.pdf
    • http://grupophi.es/uploads/files/87570874220.pdf
    • http://wang023spa.com/userfiles/202107file/2021072009114470554.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/tuxulovusoje.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c9db687b---27873152814.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/jaxezexifimesulufuge.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d98cc05313b---kafarobe.pdf
    • https://aromamarketing.md/img/files/natujop.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160846129f2308---kijoguwakesagume.pdf
    • http://hwayoung.kr/upfile/files/70337919866.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfd.bin
64e1ae5797f3263e1a31ec01fca0909149fcb83da47c4b8247acc96950345872		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 18032 bytes
font_01_sfnt_off0000fd01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 16792 bytes
font_02_sfnt_off00011518.bin
9aafc10beba9606fa27696159f6e69737847351d2a80b3a69375ac92472f1a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 10576 bytes

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