Malicious PDF — malware analysis report

Static analysis result for SHA-256 77480d856358a4e7…

MALICIOUS

PDF

86.8 KB Created: 2021-08-12 22:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5266d9e4d1f2c0fa6008083af68dcfc2 SHA-1: 0d8a84760badc08e0b8b647958e75d0b40a070af SHA-256: 77480d856358a4e79518c2047c0396137fce7bf149eff6ecec0641eede9298f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and other domains, likely to distribute phishing content or malware. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=domino%27s+menu+pdf+2021', suggest a lure related to menus or documents to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=domino%27s+menu+pdf+2021 PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910b851e4c3---punakedujetuxivumikidowu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea32bcd188---dovumejezopitudo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f129f29a2---lemitubosetisoz.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210812_54C4D8FA856E96A1.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3921d4daa3---xogib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/41659afbd2c6099f79fc718271a11240/67682764197.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/mumularelopazugasojen.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2131e7b3a2a4d652840ce9cbc196c7ca/juvedelifabimumogipil.pdfIn PDF document text
    • http://staropolski.net/Upload/file/52442277073.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/49613462752.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b99qu1huctr63lke85r4v9e4sr/fepesonawu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dda0a472f---kejexitoramexiwusobiv.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2167b8f6d---71156074102.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/61660968357.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/baxarewekemasabanutikoxen.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/27a6a5df731b47cda513c5b3e6cc7f78/26638799343.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b2abcc23---19848639742.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7o0kmajnv8l53qhrrvc6fu6q15/pilibegisukewupemebupasuj.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/97011995934.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210731124637_96uy4t.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a18b71d1d---fumelov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 17552 bytes
SHA-256: c093f004a0b2daf8e4c5a849726452e7907b12a84be73ee87cce08ab07b21339
font_01_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 10680 bytes
SHA-256: 9e06ab5230e5cc05f6d43144434bd7a4ec1ff77047302b112ced9598d0f28621

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