Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91659c35bb6ace6…

MALICIOUS

PDF

92.9 KB Created: 2021-08-11 02:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3b90be059b01e5e0cf4379df472256b SHA-1: 3da6ab4d010c03ec22b082a8e39162565ac8e337 SHA-256: a91659c35bb6ace63d58a3d517456c68ec72d9a55984b60acf9beaffe25fe642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=man+and+superman+study+guide+pdf PDF link annotation
    • http://beiwendq.com//data/attachment/file/zaxesolesizu.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/84346570107.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec65e52a40---xesepuzamoxitewosuwab.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/webigorixogafababevukib.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/vefalabefusaj.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/74775714925.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/fegujerosuz.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/buroxasafut.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7df368816d9e01e80f3c97a9207b60ea/61964088059.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563dd8edf2---lajewevuw.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/76543492120.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/60625204516.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/fidopupebak.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963098a3d31---28195593172.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/89dea8a4eb533274c3ce5d4af041cb5a/texazebumakusonuda.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/tamajegejifenade.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/xixujiliborasebiro.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zegigaxosevixumuxegelaxi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/sedosinojosaroduwixol.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/20924708221.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a9c40a31d---vuwun.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949288eee30---jiporosabenib.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/38dc07bc03e1aa4604a304429f7f3f7e/nabijilemirujasutibasaluw.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210618084721.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084a91c6f5d1---kemozirod.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_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 17420 bytes
SHA-256: 34dc430cac59ad5aaf8ff64a92a75ca1c8041cbb3bf41ad834c41447af6b2d1a
font_01_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 10880 bytes
SHA-256: e48a84e8ca3057e0ff18a216ccdd6a4d821f2a83729efb9fcdcdbd91e9374355
font_02_sfnt_off00014d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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