Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef363ee26a3fd8e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 21:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f94f1109f464560e6982f730c5a636d3 SHA-1: 5ecdda7e136f0f5abcc0085287ee8ce4c537444c SHA-256: bef363ee26a3fd8ec6f3765d1460284115e1369677e87d5e27fe795b0a781bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or phishing pages. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=arithmetic+reasoning+questions+answers+pdf PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/746c6b6e6d4c45006b3ab5665c50b87a/30084375907.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/46031405847.pdfIn PDF document text
    • https://foulardfotografando.it/file/306448380.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/20fc8766e390fb25042227e74d879eed/ditugamojerowomatiwuwe.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ad241f38f84f3e34f49920f41301558/gumowozuxoxuruvasujo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/dazidogibafadefanavumi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec44399991---45574393554.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/29917853946.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixobedumo.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/27705143959.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c8ecfe3cce90963131dd4add4425ab15/xepupavugidow.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a083fcceb7---wujegenewajuzojeroxak.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/mivelevuzufubamenot.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/4591346533.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/99631ed8607526f6fa8e97f377fdd0dc/fibuvatefo.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/vuzezezezetape.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc161b09445---zovufifef.pdfIn PDF document text
    • https://marosme.ro/hirek/file/kibogoj.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uf0psqe80h220a8qvsisvr03g2/10554336048.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/9207062806.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/vezefe.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nupuxezif.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/namuderom.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b0f392b0555f16aab3da8ee24110a73d/44933146397.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202108240452581808.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///sibenigesopodipijogu.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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 11332 bytes
SHA-256: 475e66ea1bf9e29e15df625d7e44400a28911f04e56ecda9e4b09aea50a5bbd1
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 19052 bytes
SHA-256: 936a6075ee5775c94cac63afdb6ffda995c0387ee29780e1376e73fab58a4992
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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