Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d351c5fba6ccca…

MALICIOUS

PDF

73.3 KB Created: 2021-07-15 12:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdda60d6a8f35259af8934ae3bc9e30e SHA-1: fe592c6f55c8ec7394fbe3c43384608151c8eb0e SHA-256: a4d351c5fba6cccac09886014fa241388d220c750f5c82c48def3fe3b667ed5d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efeb086f309---kugijojemowuxavojomew.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a5fa864f6---zawebujolubadazamik.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3bcc6ac954122fc7f825f79937726af4/25886273189.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0ab3c222---voperivuseli.pdf
    • https://associazionedynamica.it/uploads/file/22412312899.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab08149971---jejenodebufipej.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160727858e2054---xijazufozirimawarezewevin.pdf
    • http://dpsszczytno.pl/photo/file/59583269537.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1383365356---31027118015.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be7b912db---vojajurawujasuzavunubim.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/fomiko.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/344f1c233ce75a8795c8a0b5c48377e9/wezikulifoxuponifile.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeaf0b63e8---90861560434.pdf
    • http://www.findvoters.com/userfiles/file/nijufopoxetikusigu.pdf
    • http://grandp.ru/userfiles/file/59605417034.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072338052a51---bolopebimivawonorap.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6cab31390---24034524519.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898bc6440ff---wuwatebebe.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda421a4e4---wijexurajifotedel.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p4j12gl41dfo2f1173foqn511d/wosadigo.pdf
    • https://polandpools.com/contents//files/18898081293.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ee696ecc---62262889402.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/90211438427.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210608_A23A30A8292D734E.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=uninucleate+muscle+tissue
    • 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_off0000c174.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC174 16792 bytes
font_01_sfnt_off0000d986.bin
f62c306f47230c6f72eab7b7b255f24f56471490571ead9536ad313f35cec731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 15284 bytes
font_02_sfnt_off000100d2.bin
ed3d32d21ac829911a85218bdbbfb926eaf2359ef918732e108399caf4657fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10276 bytes

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