Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa743d71f8857958…

MALICIOUS

PDF

91.4 KB Created: 2021-07-02 18:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3e4c0fcd7f0d1a8dee7ce8aaf9d5bcbc SHA-1: e6ad1b14f82a4665a83d6a0ba7e6248c341e5627 SHA-256: fa743d71f88579585c9a02cb7df9581789a0d81fa31a2d066c28bc401bceb9ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The file's structure and content indicate it is intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=cutting+trim+at+a+45+degree+angle PDF link annotation
    • https://coluer.ir/documents/file/buzikefumil.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/55829682641.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160da53ab3243f---69947973934.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d5a67c6b3d3d863dbc1ac7c86ee2403f/63890296593.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/90a1a73cda3a12ce3a009546cd7d8a51/63869528978.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/321352c2dd74aa464c3bf2c5f393d8dc/69229576190.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/7987881356.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/xusovadavapivebuse.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/09721f31598b6804c1af5b1eb3dc768b/xonevujedin.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cc69e6b8233c9ea99de4930b40132130/wiwowo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b9f099d429268536fbd33136e5c9064e/jusawigezusa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/93a2d04667dd8112f7eebb7acb6c9f79/xaxaninigep.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dls3odcsmvnpsrh4rq9ob0thbq/buralaxe.pdfIn PDF document text
    • https://soechi.id/userfiles/file/dafugedat.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a8360587---94721740935.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c5c77b4d4---rovefukowulozas.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6da49d304---3499653677.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zedatasapudofudowitu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/66402215676.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/77350097391.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/81205332085.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a555073e714---natez.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/bvjcdbog0i3nf2o3onfdfq9890/75412269700.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_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 16516 bytes
SHA-256: 7ca9cfe82d90d51bbae2e5933405dee0c721b9df2e19d34b85bdf66088c6e9c4
font_01_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 10648 bytes
SHA-256: fcc1a7bcaa78562ce5797583a8cad5a0051da5b2376cbd4c73b9e0f0cddc800d
font_02_sfnt_off00014874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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