Malicious PDF — malware analysis report

Static analysis result for SHA-256 9912c2dc79fa564c…

MALICIOUS

PDF

73.2 KB Created: 2021-07-14 09:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b8755517904a0662a5704e78823c0c6 SHA-1: ffdc32d4f90d392ecdb8fed417be639284811a85 SHA-256: 9912c2dc79fa564c84afa7fd194f864a23900002e12c0a4aa55caa99daf73e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to direct users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d6789350a639389c46c4e8dcde18f95/82576792221.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/79f6f8f5fe3e56633a011559b0f8aca4/tilegako.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1018f864---57179759868.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784ffc6ad41---zefokasipexafipewakati.pdf
    • http://w-f-l.de/user_img/file/59452532108.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc6b9a89---48791600686.pdf
    • http://aihyang.com/userfiles/file/66474827152.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5d7a93c3747fe02e6b6f05383cb19c3d/telalotigodobo.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/v9ln3gklccji4hlj3sq3ee90v9/sifinulazokogiw.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c6bdb8a1---xovogup.pdf
    • https://dichvumayphoto.vn/webroot/img/files/24420452388.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/5700014160.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/r3hrm37dkib5p5fl2eeb21lgre/bexelakipipo.pdf
    • http://playeasypiano.com/resources/fck_images/zoxudifaxepewod.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a392452b392---63100851812.pdf
    • http://kasargod.net/uploads/file/87646856518.pdf
    • http://absolutelyneon.com/userfiles/file/70669384986.pdf
    • https://ikitellirezistans.com/upload/files/godijasesilujod.pdf
    • http://jarosi.hu/files/file/sokasajifeduligita.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/71766162617.pdf
    • http://j-club.eu/userfiles/file/nababexexamitigo.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/newepavudijotuxewisalapoj.pdf
    • http://ankurgroups.com/userfiles/file/tukijej.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2bcabce0fa5993545fec60dfa6a9e4ca/66811125334.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65c7d258fe79f5ac49dc4975ed4cb41e/6333344372.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mp3+tokyo+ghoul
    • 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_off0000bd6a.bin
d3bc64182ca0dc37abba5c3785aec50a8d7a216dc1aecc20a1b4bf04edf85b23
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10244 bytes
font_01_sfnt_off0000d4a3.bin
cebcba85a7d519e8ff4b65e523c2f2f3d1915dabecbcf083ccbad093fc1fc41f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 16588 bytes
font_02_sfnt_off0000ffee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 16792 bytes