Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d7f662e3d59048…

MALICIOUS

PDF

118.1 KB Created: 2021-08-07 09:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce079ad40b21fdd7e80b622c279f193a SHA-1: ee36f32501755651d5e10981abf60b2baf7e7653 SHA-256: 36d7f662e3d5904853368e2fb2de55c23ea2a901287abd97427ff204661c9383
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/05b78fa5cba0fa59607b0dbf1c1f5430/16714442319.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pen5bsiqcufj4h6colr59gi8n4/71920457632.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/34e726543c7bfab3cc8d574004fcab64/fekelelor.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4416d62a82006c7bdd22a868d874d602/vaxinozalov.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf8f1979d2---voxexevikaminexovor.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/kawatusidabuvoza.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/24029917393.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/48962471697.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4977d331c70bf90b990524533e3422bf/kagekuni.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wovow.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/nemedunanuzodejatiw.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b90eaeab0---29919026578.pdfIn PDF document text
    • http://geoman.cz/data/file/ragukujijagilonib.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/e90f3ba7931385e2890b26ec60896289/wokaxozajatadipemobizob.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wosuvumakemifozudagimifuj.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/7625a372d83eb279fd2d100ea6893c48/zesuroropogeni.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c626f4dcabb2160c617f7e116ca491d7/24068296969.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf7a41f6ab---97018799227.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104cffe6db01---lixadovoledalotifux.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/cscabt496t09ncubm56161oj62/7991878752.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161000dd605cca---jibik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=video+editor+android+app+source+code+githubPDF link annotation
    • 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_off00016909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18120 10956 bytes
SHA-256: 4549029abef7d80952d299db5a9ac36f5eebc8a2584909fe7722e9fe957159e4
font_02_sfnt_off00019a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A0A 18100 bytes
SHA-256: a6ec2da702a6c95cb76dcd455cadc03841a84540375070b2b0938e292cda5a11

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