Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda473e57bfa5a10…

MALICIOUS

PDF

115.0 KB Created: 2021-09-06 18:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 94075676b0d29b9b532da450b4b7ad76 SHA-1: 20ba36df694cf3128c8e33f5c3f0cf4dcdeee6de SHA-256: eda473e57bfa5a103624ff5868288357381d6b2372aacd7c3e21d9c139e9f499
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this, indicating the file is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2609

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://infrive.ru/uplcv?utm_term=manual+musescore+portugues+pdf PDF link annotation
    • http://upsshop.ru/ckfinder/userfiles/files/32546470962.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/41454943599.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/44340317759.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/29171042732.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/nugerodugozizokabapises.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613478fa2b534---54492737404.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/7270414160.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kewubawerakarumowitomalu.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/39963916883.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489e303906---75002189128.pdfIn PDF document text
    • https://artenika.pl/fck/file/koxawidikexaros.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c95dd7baab8---72043750242.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/parisunujewi.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/devomufuvuduri.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aad5d1c2a---45751855480.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3d7830a30f824e2904b272d859d07526/sukugerununuzeku.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/9476007284.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/rosilizonazanunegipesijut.pdfIn PDF document text
    • http://lukinserv.hu/file/direfuduwetumos.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/jodunezegin.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efa22fbae---putunegesa.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/32750686583.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/pifowudajadikapasapasi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16088 10964 bytes
SHA-256: 19ec58363a6b9bc5842094a468f98a7f07ddfa0d42b8b0101881f7606bcd47d3
font_01_sfnt_off000179c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D8 20252 bytes
SHA-256: a5559ba1457a65f9fc1c3959c1da0f8c03186d5bb5ce9d658552364eb646c786

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