Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09e2ffb3e60acf3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 02:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdeb00d5b0161db78e2de25aa9bb5646 SHA-1: ff9355324aac3192f6ecf6a9b42d3f731064189a SHA-256: e09e2ffb3e60acf372a6f424c42eacc3ebd07f7ae65dc3e04a975de1a08d25b2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple links to potentially malicious sites suggests an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ed5f2801e9d8408e714b67ea82c8e1a5/serikasimoj.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd67c4ee7a4---nepaxilejituzoremefub.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zokisixuwixa.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835636b2ed0---98533775184.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cs66iq9bkolfklj398h89j50hi/94834725500.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/saxabirulut.pdfIn PDF document text
    • http://dhf-china.com/d/files/62690065144.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afda58d9bae---muredizeputufixixenun.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/kuzokederogovi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e930e271---letuxitilezusenazeperik.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c5e67358---94964164780.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d11bc557---41139068796.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106100116128837.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c703107e79405764252ba886dc00a882/71589724158.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gevaxewoxejugezuzamofuled.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2356290c8---23625967142.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3947922429.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/55500057182.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4stnvlm4lekaqbkvr8461o7fsv/13401609410.pdfIn PDF document text
    • https://sealskinz.ru/files/file/vovakanetu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/99097182334.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/42128048187.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/vexevafezozuratatifetet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=john+f+wakerly+digital+design+principles+and+practices+pdfPDF link annotation
    • 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_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 22292 bytes
SHA-256: e106534263edb0691185e74cb13bce5a9c7e2cc0ec944b2ba1a133f16491567c
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 11180 bytes
SHA-256: cf0e10a65ed9535a58c50c450415b3ce0e4d928c8630e25769bc9cd82223ae7b
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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