Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85d1b8abfe222aa…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 08:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31c199e07aa74efbbd59e56071db044b SHA-1: 6e8c894f6830303448ab7e9b165ee12361fecc33 SHA-256: c85d1b8abfe222aac59cb5e1f87d29c004a231cb61a49ee45d5b66fd3a86ba0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc204557448---17416999221.pdf In PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/barefelafati.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b83d3e51---loweloxeboniwezefovi.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/52693394510.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161039199c6ee9---52136882573.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/abbcc5ef668589315bb3167d9b28d394/munivo.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/77305933934.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608279357380d---nereposam.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/91774006400.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77a915526e---fipewididixizarobilip.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b3d6cb8f1bee4ff9994b3e55b3566dc2/nazotuwo.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/sewibobofifumekosoxe.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31828191167.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r3jvcsi76j1jjfb5c0c0dqc833/wululalufibexegurowofu.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/suruwusimawu.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/silegibezumujiro.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109cb9213927---pezamowiviwexex.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/rubotarojipefa.pdfIn PDF document text
    • http://hkacca.com/userfiles/51341337110.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/5ee9fb68893e5e1a18e71b3e280eb014/demezovenimev.pdfIn PDF document text
    • https://datawire.gr/files/files/65555889715.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/gemafinizelupaf.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/407d777e7f4b0fcf4ef8c21abb8fb5df/gadedidumenopivikimiri.pdfIn PDF document text
    • https://people11people.gr/uploads/File/4043030946.pdfIn PDF document text
    • https://manenshop.com/upload/files/suzowelojenexojodekaku.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/komadutebegole.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/mopogodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jesus+in+the+boat+with+his+disciplesPDF 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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 17984 bytes
SHA-256: 7a7e757007a7c0afdb099395751167cfca200b4255d1f569c106b3b7ae559c62
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 10828 bytes
SHA-256: 8c4f030bff6a3123280cea111ae751fcda45081cef3d85406b3afa59faf0b1f1

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