Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83523cbea9dc60…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 15:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e66dc4003cd77310d4663d81e215d2c SHA-1: 9ba510fed937341e9dda2309d24688794525c641 SHA-256: 4b83523cbea9dc60f8d3e86d76021bf60718d34f7e98bc25c7fbeb0e1bc489de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristics reveal a link farm structure pointing to compromised WordPress sites and disposable hosting, suggesting an effort to obscure the ultimate destination. The ML classifier output of 0.999086 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=can+you+eat+walleye
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d3fb201a---85672282132.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6u41lkmd6j3pll7co7cvgu2b76/temozosuverawixenumonu.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c0353e17b5e---34144416817.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1baa402163---pejazokurixut.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/65948fc759031f3413918da87b352300/nipanebuvuvewawifiwof.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/30613a28b3a5a07e02e6fbc39d8c383b/manejiwizuzodazulitujuku.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a264d73aa36---kukejeburugigifu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c646af0b---muziximegedegunabew.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f35920a3f---17484525372.pdf
    • http://yossy.biz/userfiles/file/biberebe.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9r92lillfnd240j92v3no3j7pk/91639872142.pdf
    • http://ricarda-allegra.de/userfiles/file/16477944626.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9hio6c2lp86a43fdbcu30h8irc/57889300607.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a756c623b---porogimelaz.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb60f1094---kilewepadudukodefuju.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_off0000ee4c.bin
cc0210fbff39aef3f4b0fd41235481a51c62384508590056b8c85ef18f2421a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 17900 bytes
font_01_sfnt_off00011cd0.bin
f1b282d71362b646c3df59aa844a43a7899e84fedad2239e3d0cfd540b08aaeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 10072 bytes
font_02_sfnt_off00013380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 16792 bytes

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