Malicious PDF — malware analysis report

Static analysis result for SHA-256 92687fdd4669e55f…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 11:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af26198a2a236137afd62986d0d2baab SHA-1: e4bb43b6a865fdd12c0fd703e73fce6fef9fc8fa SHA-256: 92687fdd4669e55f264bcb94b42020e3a7e5f39ff18ba0c66bb89b6b51ac6df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=stainless+steel+and+steel+corrosion
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/47081012d998d7058ee38f8f0b6eb31f/98313177880.pdf
    • http://swaminarayangm.org/userfiles/file/6963058877.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590b616032---lexomozuruzajimisude.pdf
    • http://runningrhinelanderrabbitry.com/clients/875187/File/97495957069.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/f5itlpgan9u3r2iial087jhfmb/30967124.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d6aea6765233389708cfc0f49c1ad37c/wijixolilizu.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094117872c73---benelib.pdf
    • http://wittlich-luexem.de/userfiles/file/82589216894.pdf
    • https://canionglobal.com/FCKeditor/file/64875607198.pdf
    • https://aspirans.com/files/file/11799507837.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b3a644d5---99695499523.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085162b649ea---pesobezimi.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c913d9f50bf4502cf3a3f3831c17da71/sifinuwo.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b74d546bc---29009235505.pdf
    • https://xehowo24h.com/images/ckeditor/files/julewuz.pdf
    • http://lab4050.com/upload/editor/file/65174172918.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lonogosogureselomonobuxe.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ba6ef303---30063418580.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6666a8b55a5e599a770dc1b89fab05f1/78801660419.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f2e92dcf66bcffc1e1450e4a3698902f/49755818989.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/5108064720.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7034ef59827b038e24bcea6247c3adc6/jomejubixula.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/3448024825.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814cd01eccf---fosezoxawenodasovun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688641568a---23679021919.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf2.bin
6ce50496b08736a2166fdf940d9fbf4273bb7e2dace59d3a2180e2e41d681cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 18996 bytes
font_01_sfnt_off00011e4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16792 bytes
font_02_sfnt_off00013664.bin
ea7c64acc6a8692fb38979306da9856441d85d78807bdec18182b1749ef86ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 10440 bytes