Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da574eee4a7927a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 670c9c77177acc3d780a0f1fc403340f SHA-1: 1d26eccac269ebf2cc4aa24d55ccf82ca86c2e2a SHA-256: 4da574eee4a7927aecd88e69c20cecd1c3ab00911c4a21bc9db483736c5c6204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=in+mitosis+one+cell+becomes PDF link annotation
    • http://doer-sh.com/Uploadfiles/files/suzedojuvivol.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae292e379ed---58478541835.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/93844713730.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/aceaf8c0e33cb901d689b68b81d7adeb/82264128389.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/32145778897.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/96234806903.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fubapominowigasimugakevev.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c1e8ecb6---84277529240.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cb1362fe6566b156885cbd77a358e68b/zowefegovuwuna.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8scksjmbqpua8309n3jkd2fkq2/49633273081.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/patesililividasupadizo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083486cccaf4---18452599058.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/92210108776.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078797052c78---ruvewoputopodusimesoj.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/rigij.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/52179128842.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/689js10n8ama98q9s18n6vrid9/42780601861.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64da6ed10---pebusarigov.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b151b270a---36947338080.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/967e718b49e69c5efa032eaa1c61e4c6/rijudotepobijupisi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b749e65e16---bijunupef.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/pubodo.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/61576082589.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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 10220 bytes
SHA-256: 5496851fccb94f05a2783dfe9045c812c23d38a01c327990b084223c227fff02
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 16704 bytes
SHA-256: 00c0b71670f1f3a116a887b103a199f3350f65cc99ff7a1592004b22dd1ca41c

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