Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f34901210b034db…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 00:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cbcdf3aef2f4ed128134880f68d766c SHA-1: df5b653ff1b2ae37fe59fd94b6420c9a3f7564b5 SHA-256: 7f34901210b034db86099665fc81d81ed415ccd0fd86aba7b999417141d42c32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is intended to exploit users via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://infrive.ru/uplcv?utm_term=right+to+be+informed
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dfd2561bd---48096063233.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e0322cbf---96812378597.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e9bd48edaf4a410895a7b9b4000aecc/9496490191.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/1ucactjd0rkd82o4n8a3p3u6k5/tugutivageruwufeb.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/kexemawerufifemututodu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efe17ff99---zonoxofabi.pdf
    • http://boisehighclassof1965.com/clients/879780/File/kesituxexafe.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/af19495bc74d28fa17aeb966b5430cf0/suxawabojetulilovuxe.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca41e6291---14542243271.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-5/20210605021847875975.pdf
    • http://ngor2-3.com/file_media/file_image/file/27026326599.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609325d8de0d3---sagafabimodaluduxugenudo.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1039327ebc5134ce17c0fbb3932f2569/67985562301.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22b8e0a1a---4929903206.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a188c8a24f9---doduta.pdf
    • http://www.sport-konyv.hu/userfiles/file/34559118537.pdf
    • http://atek-ent.com/upload/file/98279671150.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0416a6fb28---8369565342.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba92a914d---53139724949.pdf
    • http://vksraja.in/fckeditor/upload/file/fokafifuxolufudetojojaxa.pdf
    • http://flatadministration.com/uploades/fckeditorfile/rujewi.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f39cabfe9---mejedif.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/dubaponinekipopamivujefe.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/69a48453f607425bc03af89b507252d0/lexerubifixefimadigak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 16792 bytes
font_01_sfnt_off000118c7.bin
62228ea3e96374cd738dbc4cac6a826d12d4296658de3c8268240840286ba57d
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 16324 bytes
font_02_sfnt_off00014316.bin
fef93b9f572a888044faa29339271f8d395f6a93eaf4f97e32126986d10c1e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x14316 10608 bytes
font_03_sfnt_off00015ad8.bin
3bc0da270f28ee03542827c6bfe63ef05d2dce13e35e9d71fbb8b010c39cff9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD8 16200 bytes