Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7037eb48e025c8…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 23:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b792201b785ed2a2b778bf3eed7ee0b SHA-1: 270c59d03667d21456979b2967b0e3a904298fc7 SHA-256: 4d7037eb48e025c86008dc730421d16e4cc4e98bbf6e38e0a62cae4f433d625c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=the+greatest+showman+full+movie+online
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a00bcad6c---73537903583.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jabefagivafadofos.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608334bbe82f5---9463041572.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/59c7bed4e224fbf2b6c574a3dbe9c083/safosa.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251ec4c2fd---kojogofexuboxafuwerazaxa.pdf
    • https://turdv.ru/SITE/files/editor/file/68228687219.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/90f144uu1eq9tuejfaoogvidtv/82853395198.pdf
    • https://lawyerupsmart.com/tempimg/file/77603553673.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2b4bd0ecbd00ece3227ec6d6a8c04cce/nofuxuzawekafu.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0afd86aae---jajelubanagefogab.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/03c2d9d837e0cbe7d9bc59a830dc5f5d/74049715691.pdf
    • https://bodegoncriollo.com/userfiles/file/geledodebojopa.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22c151e13---94063311311.pdf
    • http://php-lounge.de/userfiles/file/ganopagaruvifuvogiw.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc5fc69e6e---kezaxerojov.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/437d142e01970e02550729c32b9445eb/pokofirumafoxedeloxa.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de271869c0---91533154698.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b5e5c412---21553955165.pdf
    • http://smartcevent.com/clients/871459/File/digoko.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bee5460b9a0f5237d0bdf7fa5b71fa65/nasen.pdf
    • http://topcudental.com/img/userfiles/files/90579594048.pdf
    • http://karat-dobremiasto.pl/userfiles/file/bugaronajimotiwurexov.pdf
    • http://b-solutions.net/userfiles/file/voluruluwi.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qh2cou1jetj7h7l1kt6efj582f/tokujusumaxopojuxos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77a.bin
bcb401411219c87a2dff02a5894e4d68ac132e5aa5cb2ad093b45a5c58c940f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10876 bytes
font_01_sfnt_off00011082.bin
583ee21ff1ace0df4ee9bc554932b89bc47b6e2f777692fb02b750cc38e6ca03
pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 17528 bytes
font_02_sfnt_off00013db9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB9 16792 bytes