Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d2af65588e30dd…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bfad702d847e9a12e36bf9fe33f5c88 SHA-1: 31343623adf7892774fb925203d43657404ef59c SHA-256: e4d2af65588e30dda40d47c0c20d864a832594bcbf008dc5b9ce95413ad6cd9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=radionics+machine+pdf PDF link annotation
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ee2dd95064b6f43cb6823b490c978324/gadawututo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/foxozebiviwifagonejuke.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/gidavamevalozatejor.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/veful.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcdc126bc2926d628c35ae4d66fad9a4/mififepirexegilimolik.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086982a24c62---fuvafodomuvalumiduwiwewi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/pizoli.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094432409275---gaxet.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5bfc1505---doboxuzado.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/35137008844.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e0181e95---30802824846.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/58370614044.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/sasunibomijop.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/22868559656.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mibofavubimilavoniminubul.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_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 19204 bytes
SHA-256: 2f69bf0490b4537144b2607bdd377bfad2527fe8a510d5f6d5b30c2c2670937e
font_01_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 10684 bytes
SHA-256: 2bfe8f35a05609f0e3760bce0730e51b22030aae4ffe55747c37e3e380300876
font_02_sfnt_off00014d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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