Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d746e6953cf763…

MALICIOUS

PDF

88.2 KB Created: 2021-07-08 14:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04985900d9ef8e5064057d83e7eeb0c6 SHA-1: b1287bf448ae66eab1b3a87755ed16ad8674b9c8 SHA-256: 75d746e6953cf7639c4f479093cca431ab403130e36c24be8d350d65b200b597
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the file functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://gshosnab.ru/userfiles/file/14232543855.pdf
    • http://edgecs.net/documents/genokugimadotitefe.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1a3ac2472---54214407725.pdf
    • http://446888.top/userfiles/file/lofananime.pdf
    • http://nesthomes.in/userfiles/file/zezapukopokagukomige.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a923518e31c---kadutapopizevuditimapatu.pdf
    • http://poltinka.ru/userfiles/file/bepege.pdf
    • http://auburn-properties.com/userfiles/files/gudovutidewedowij.pdf
    • http://safarang.com/basefile/files/96033883126.pdf
    • http://mamam.by/upload/File/file/forewadizi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abdbdc4c52---towuwotobeselizur.pdf
    • https://palcev.ru/userfiles/file/94981101263.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9fcsug1e9rbkdqc96u4rh15jf4/69667125967.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2e9f1b9b---2049984258.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5da40ef91---69616122839.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954285c37a1---fugevofapipeluvewowadete.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fc00d10c---vuzibukafixug.pdf
    • http://boissee.fr/userfiles/file/37880015931.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/cdb49fce954a2fcbea6d8f27e5090ea2/fodewogefav.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a37608e7e---visefizirid.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c98d4617---ginotedu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d115310d54---soboxegugulimuniwumisevi.pdf
    • https://amitadevnani.com/userfiles/file/fujapalavagufelil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=less+affluent+meaning
    • 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_off0000f28f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16792 bytes
font_01_sfnt_off00010aa1.bin
a242760254bac33400d647ab3f4748d59d68916452a4075b93526c5a285e9638
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 18268 bytes
font_02_sfnt_off00013aa4.bin
aa0483dcbeef6abf4ce8575ce8f021f93d1616e1ef185d4d4655f5e349c49022
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 10396 bytes