Malicious PDF — malware analysis report

Static analysis result for SHA-256 2029dcbe79bce364…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 11:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9b6939ae3a343ed30c264c22b3fb49a SHA-1: 381de002106efcb326015ab3f8c874bdfde5565b SHA-256: 2029dcbe79bce36456aca3f6e5447660b0f82847eea6a33de7072b25f50f4156
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of specific user-facing lures, but the overall structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://ammk.sk/userfiles/file/zujudawelakawusamabexi.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/maxisoketozalepobo.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/tazubenosefukolaboj.pdfIn PDF document text
    • https://estoniapools.com/contents//files/80905011146.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b9a0bb3aec7216281f6e8fd31edca057/ruzubob.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf7a53000---sugobixajelarapux.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607074996dc83---fotosos.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/88832037775.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/91073629207.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9930e25a2632d671e5028c9717fd3d78/wisesososivinexak.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/tevamepuzebiwuwetak.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vofuzejometixoruzile.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1dfb65199b7e697d4ec0b49e91d0f688/5423826920.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/mizegixiwebifidajinuvedul.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gokumasugararavajotodelon.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/43518249208.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7d2f11ec2f9573fa13a56550ce74680e/wezuvafipavaparike.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/322ed0eae69e27c8ffb6196afe2f686c/jomapogar.pdfIn PDF document text
    • https://epiphanych.com/images/file/wefixawukodaregibu.pdfIn PDF document text
    • https://auto826.com/uploads/files/mikepow.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/punobev.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4adba66e15f15c23ea900976d1564d85/dumapuxuxitaxudajo.pdfIn PDF document text
    • http://snsi.jp/image/news_file/delodiwumesuzevonexuduj.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/be880fe722e295a764b101ace60919fe/pewuliju.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xutufivatusekakafejojaga.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e0ea1bee64b9b2915b427d2d34ed2f9c/58457171207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=publicistic+style+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/vuxuzimisadama.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 19600 bytes
SHA-256: 61d8079f9f13fb32ec15ebf6b8c2575246dd6a2d22baeb808a2478fd91e4dea5
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 10480 bytes
SHA-256: 91cb04ad0123f09797144e1fadd7dee6fb2533bab5e64fbcad790568611cada1

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