Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a98faca8ffac30…

MALICIOUS

PDF

99.7 KB Created: 2021-07-17 22:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b4817e2333e2e97b1cddca2cfa315b89 SHA-1: 496d1a805bfcff65c708db57d8d52efa3c35ce0a SHA-256: 25a98faca8ffac3080ed6b9dca8b23128adf0765101ed11973a1d103dbea90e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. This pattern is indicative of a phishing or malware distribution campaign, where users are lured to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pnp-studio.com/fckeditorfiles/file/48973293642.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7290b8a440---56942281704.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kufulefesejubopum.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a03aef00a392c826417dfcc32e33b16f/45179467289.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/pegupisijoja.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d7e0c95ab872a2bf946683a08132b368/4351847137.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7a4948cd14b8a2facaddab3e7f5cc2c5/61286419659.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/xovorulozozoto.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f3d7a95c---22894121538.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tdpo0u07kuuvqgpt7o17clvmqi/81047957803.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9dd9e1e7---8045301834.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/28136190265.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf2143c65---71847776381.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6b41fdeee56ce52e16e38094600bcf64/28842206465.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wabejulab.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/fimamosow.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/92a06b464ca0a6d86c605f3601256970/povejag.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091969ac0e52---munozovajuvoroga.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/52773498148.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wimomosozudu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/76b8c034c9bb230c8e8f83898765a9b9/92916280326.pdfIn PDF document text
    • https://egf.tw/test2/images/file/bapojoboxazuwavo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec693a3a9a---13294980452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=beta+function+gamma+function+relationship+proofPDF 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_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 21068 bytes
SHA-256: 33eccfc2e3d9a7782b8102cf80e805c5431511ef43c89e0f4cc6eb23028832a5
font_01_sfnt_off00014fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA3 11080 bytes
SHA-256: db1c2cf3e566de65d1c872af77df86a4cd9aa183286b2b7b3b38905fadf011db
font_02_sfnt_off0001694e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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