Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa28eccc65f58330…

MALICIOUS

PDF

90.5 KB Created: 2021-07-08 01:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e54cd7a762e401f80a0a1374b348c01 SHA-1: ee8d4d8d5e6e993fe7770b265a5ab905a1621d37 SHA-256: aa28eccc65f58330576e9f8fe9c5f951bc2ebfa1c4974e4bef8f3bcfef8b1bd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ketchas.ru/uplcv?utm_term=caffeine+and+bloating PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ff2713dcaa211e46a9acad4a00c50494/nabimabevafagerubukevuf.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7124d768---90894462183.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb38bd4d3f---20715535389.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ushnd2vispig11emcsm7f6otht/mamojiloxeborefezajik.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/46483722719.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/54604856844.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071115f43c9a---gigelebererer.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/sevazoledenus.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/deredipezuzefex.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be61bd40c9---22130472646.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/37910126638.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/22071867079.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bac62214e---dowubakogabexumini.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/xavaronifexuvoligot.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/33e2c93c8c24aeb2c39b3f32b4b3c349/52348320922.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/dexuvofikadarox.pdfIn PDF document text
    • https://motacademy.it/file/sixaroxanuleselivifudojip.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d39dbbd83c8bbf4ef356b975f7c1f819/1590510162.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/legumexo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/vevex.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/57876737532.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/duveluvikij.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1622966679.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_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10432 bytes
SHA-256: 575a0c8a1939ce66321b0236c9766f24b667c5f6017aaea3e3a4984c16aa956a
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 16808 bytes
SHA-256: 4f8003ba4106f626b1b7dbdbb012da500f07bfddd58b0e9ee0aab3cb1b3eee62

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