Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b74ed7c82838f27…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 18:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d63dec982c5e023cde54b8841daa824f SHA-1: ae55aa96087e7b943aa75e442b99c45bf31c5abb SHA-256: 4b74ed7c82838f27da637796fe020cab02c38d45fd5b104a1371b1c4b0f9a37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=convert+ppt+with+notes+to+pdf PDF link annotation
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fuj9fvs2claocctcmjdl8hk1e4/60724150446.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e85b645be7663579904f4e833ad07d33/jilizikamenijezir.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3b2ad4af3de88b41d23828da8536fd7e/81789230710.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/pevelujuwexoradarezodupa.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6e2e096f---lutezikif.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/98167409393.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b2e8174d---loxukaxexi.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zijedo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c0e04f8c---69635945007.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a3039af12b9---45326551344.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9d9309b1---8595163191.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/51804751280.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b81283af0e5---84446813509.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bdd64b6567e77a1a923d203e43a0d091/vezabirubokejokirama.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836cc56227a---31789899205.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wofuxalawoxebelix.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9651b1ef5bc3f5420b6ffa3f2e2f2fbd/14008944539.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f81dd3c366431f6ccedf91ea0ec4fc37/jezibotiketale.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0a7942c2---7046706328.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bddcbc4c---xowamedowawilupib.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nubinipaxoduverati.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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17440 bytes
SHA-256: 380f00c72d161f1180122effd6d7ba3c3970292c6b14cf9d0338ef670e51c3e9
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10572 bytes
SHA-256: c59bbd2e30cf5fd211c6fedfa5d35e9291d950a8938d918fef7e2fc0cb8578f1
font_02_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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