Malicious PDF — malware analysis report

Static analysis result for SHA-256 76798055df476d4a…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 11:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b16c24c4bb27e59dd5f16b4929ae3a3 SHA-1: 21d654b2fbdaa293183ed5a3e8c369f54dc242c8 SHA-256: 76798055df476d4a2190d5c9fc9787f16bb97303727e10e68008df49c230fdb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=illinois+federal+tax+rate PDF link annotation
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/43093125759.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/sanegifisokotow.pdfIn PDF document text
    • https://questyme.com/userfiles/file/35641983852.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n5qd33vb82lq0ff0j0dr45h4i0/7408447208.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/40250535572.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/15377939571.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oj3b3tki2f9g8lgd7tofa80204/zobijepatanekinerazekov.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/25814459758.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gq93udqf195rbl6m3edh50dpsl/mavufobemenobejakevowefa.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/xuxewerovajezi.pdfIn PDF document text
    • http://short-story.ru/upload/file/palovaketafopodavojof.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/54112020775.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/pevuli.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/404389aeb946286cb0b5e7fb28467ac1/35471309771.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e891244455072d971cfa12666eed844e/talomadibalefinedi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e1ae5287---37075301147.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qb8c8jbmehkii1go2q6khdbmgf/jexefemaluxexawuli.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/71234366377.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/siwapoke.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/susogiv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3b531501---jodewasizigogupofi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8843cb6fe6---bedarunevebaseligebaruri.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/p60d0n678oitrchqoq0nphvg50/16718075208.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2379a516---10262438981.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/27157438577.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 17044 bytes
SHA-256: 0bfe223876cf74779386fa3efcbc1044aeba9387c9eaa3deb82293adb0a6b404
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 10400 bytes
SHA-256: a982938aa9227813e771ebe56651a75ab6ed514e81ca155ce83de9a1cee0228e