Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abd3877827b1123…

MALICIOUS

PDF

84.4 KB Created: 2021-07-05 05:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43daba11d4a8f593a024a69d797f7f92 SHA-1: 502524884b63f46dba1d0592144b81b8a70deb6c SHA-256: 3abd3877827b112339bf62bad07fa15675384a3b597abb48282a7d6eb309237a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mosjob.ru/images/file/vexakefesawofazevadej.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ba04e4ff---zataberuxukakiwo.pdf
    • http://bsinteriordesigner.com/userfiles/files/45935079106.pdf
    • http://studiopignotti.it/userfiles/files/vazidewawawifufumuris.pdf
    • http://dlzj.net/upload/files/20210619111244726555.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/99m9q1hegf8v117r4btgfbemo3/moduvovoriwupixadufojapub.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5512e1eb---14812124541.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/dc8f73cbb9a6054671186cf84b7ee1a2/1549963426.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/112c964949c7cd19f7d39be18e181ecf/kewerugineduvojuv.pdf
    • https://clubsportedinburgh.org/userfiles/files/47830833603.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/db81a6f3481463971c33e1f3fc05efda/kuvezikixavamiwu.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1ded8dcde5b9eefb55c1f187af89d8c3/xomenigosudojadijutenubi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8vn9b5bjotdnhfhc6utlqi53bg/85614025281.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184de52392---67101847770.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9b0babcf3f5ff0e81c1adfba21644526/9271620607.pdf
    • http://volamtuyetthe.com/userfiles/file/39361621417.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fb25c53dde5078f2a51f49424e30e840/87339378670.pdf
    • https://wegofa.com/userfiles/file/vawigirox.pdf
    • http://boeschfamilytravels.com/clients/43210/File/20661496367.pdf
    • https://cplastik.cz/data/cms/file/38344824502.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/lolobokiwotavimifapeli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=need+for+speed+obb+file
    • 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_off0000e8b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 16792 bytes
font_01_sfnt_off000100d0.bin
246cff4f8f79bedae88b0f3f0bb005d232bfa038281d567bfa3520f76e7602a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10244 bytes
font_02_sfnt_off0001179f.bin
ce9ba73a1b9b072f767a9b0181f754b35744fc2946f76ce9f6b78259a479a378
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 17176 bytes