Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a44ee43c118f69…

MALICIOUS

PDF

159.3 KB Created: 2021-08-25 14:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14fb1827d1cf92adc9d7545d35dc7159 SHA-1: 6027a36d10f58a41f827856268f56b11e509540f SHA-256: 89a44ee43c118f69fb5bb5021547fe61977080eb610c9f2f326782c28033d158
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://infrive.ru/uplcv?utm_term=dimensional+shackles+5e+price PDF link annotation
    • http://www.rotudavid.com/ckfinder/userfiles/files/98025581535.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/xobixebufimiwagisa.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kanag.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfdc142fb---62565299644.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/33156410588.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lifuripovugapofovim.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/52285431179.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210618140139_rgoxr4.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2c4048ba---87111280250.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6c406977da9462180f7b5b3a4f6245b5/defaluxisoja.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a949fe9fbb---zoreliwodujegafurofi.pdfIn PDF document text
    • http://cutskytools.com/d/files/kiwinelufebatonekuvo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/igfj0970rmfe2ea34pblqj87h4/74998497561.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b154a47f---fanuzogukakolebiwafa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fddf5ff1763---kajerozowibomibokasuzeko.pdfIn PDF document text
    • http://selidbe-beograd.info//files/33473457044.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/eld2fric9hvi8nva93hqqgm4er/damefadedifate.pdfIn PDF document text
    • https://wsbtitan.com/images/file/99242172111.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608258562f7f6---zivudetinuwuz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c896a7d67e4---veneworoteso.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d6ebbe06e437cb41970182144890bf8b/54787614046.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/jesagarapuxadi.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_off00020bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BF1 10768 bytes
SHA-256: 6d1f38cfe555796c4413d04e77bc5c94630f85fd19d94a4466f181c2c17af4e0
font_01_sfnt_off00022483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22483 18508 bytes
SHA-256: 10bf753ea46f57be98a47df7ae14c14c0a23f6db57fd50e2a2b0f327629fc40a
font_02_sfnt_off000255b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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