Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24a0124f47dc0ab…

MALICIOUS

PDF

71.4 KB Created: 2021-08-04 01:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0ef079092fc5d74e02bb97c1ca026757 SHA-1: a0581af7de282c435a54a24f218053d5b7e392e0 SHA-256: e24a0124f47dc0ab657dc0a98466ae8578c211cdfbf234948b5d88b54da1488d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=on+baking+3rd+edition+free+download PDF link annotation
    • http://alda.pl/ckfinder/userfiles/files/vezolotabosopubasemugut.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/runugatosidulixos.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f7fb82e4ba4320970b77665d6faab349/nemudojunifowodezagi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7a075ae9---jukowa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed70da9822---rulegevuzuzogibudiv.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/denupapilexudix.pdfIn PDF document text
    • https://blugarden.eu/file/84207513879.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/tukina.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/8425541148.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/812236781.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/34383499139.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0c401cba87ecaa0cd158b1d2601335a8/wipogalelasejazip.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/568d7210654c4f054d5578837bc1f88e/91800095693.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gowobu.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/susefaxerawotewut.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831ed2c12d---gogubapodezegaba.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/68573158650.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/85111027608.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/pogenip.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/bulumowirulibululip.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a83349f9---sasowubem.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/kawidenevodifulusejow.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_off0000b53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53A 10876 bytes
SHA-256: 1c96378d5de8384d1f813fee0b9b3ccb2d3abc7faffb3b6ddd9d10969ec65bf3
font_01_sfnt_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 16576 bytes
SHA-256: 37f3c504d1f6667e24df6a391c026f260edb85ed59f023802dfec62cc93c5615
font_02_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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