Malicious PDF — malware analysis report

Static analysis result for SHA-256 a531862622e3b0e3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 15:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2e34128af47d8b878250e31160bf74d SHA-1: 5c53ca272eb65a6dda59020cebfdea2617f92341 SHA-256: a531862622e3b0e35a39c7425c410e6a2028d50949b31eb0c05f021c851f79a7
156 Risk Score

Malware Insights

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

This PDF was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=fraktur+collum+humerus+pdf PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f16d5264742---rigafovujesapijed.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dijopuxisusituze.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b5a55924---tojuvidekezeragokatude.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/48610577468.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a9426e29817---wapowoketujopejitovi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0c7c980a---ninipa.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/74641527980.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d403c70fe9a---nuvatevo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b2347a1d---58043724970.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608faa9097762---43645868906.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/15360474947.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/031d04fea556a21801e633b21507282c/24619423114.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/fuwinibexokavubijid.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/53e291c6c8c50d08a6e6ea9fd0917386/90778130149.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/kekapig.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/49018549066.pdfIn PDF document text
    • http://demkapi.com/resimler/files/92861314085.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/kavetutodemexix.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fe8a6603d---25242303707.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/vanegevulilipexiw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f32bd449---dutabotufijo.pdfIn PDF document text
    • https://ocw.tw/uploads/files/tetujetaxisenaw.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/tesop.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0f21b95b5---fakudokabegeruxoj.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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 18048 bytes
SHA-256: da2ab54cca75936b31e621934e2947375ec4262f426f9f88e3a6ff2debc3328d
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 10860 bytes
SHA-256: bd44509fc4ab4dc7b1b912fec6106a5195ac374d3897a6bd73b1e06f4b0c6fbb
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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