Malicious PDF — malware analysis report

Static analysis result for SHA-256 b319cbc4c8272ea7…

MALICIOUS

PDF

103.4 KB Created: 2021-10-12 11:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a1c989710d3520cc31c7aab54add5837 SHA-1: 9bc89efaef2791f9d8841c562602369ab75b1a1d SHA-256: b319cbc4c8272ea7699676a0a1f50f0877414b79ddeac1bc9f0300211a25f5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on potentially disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://salman-is.com/userfiles/file/78365363178.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/buxokefununakitirun.pdfIn PDF document text
    • http://tral-kerch.ru/userfiles/file/gaxafupexibedavebusaxomow.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/86387823364.pdfIn PDF document text
    • https://banghenails.com/upload/file/35985241970.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e73826c6e49a5af0e9e9cd737b739a80/71902328999.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/tejufevozod.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/13605525728.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/82eaa8bb96a2b61503f2b8f0d1bb3968/64263477977.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021101123575090.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/39315067623.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/kumopawenogoguluvowufu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184532d188---vefaxadato.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mutosobosurul.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/kogejovusiwabixawamola.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/fogidowojesede.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210901_181A0056C7A6336C.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/vatix.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/gofidirag.pdfIn PDF document text
    • http://rubensova16.cz/files/file/tumunaperaxegifogemow.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16161c02e659dd---visodojeramex.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/wagebizojomejimujolifeso.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/35063559138.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/33708801981.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/62535253464.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010150084665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=after+school+hqPDF 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_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 20128 bytes
SHA-256: 00bb35a9f95bb05d9f994e6dded40063c6c11269d6f89aa44d13a10d6d851cd3
font_01_sfnt_off00015f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B0 10200 bytes
SHA-256: 911982575697d47dd40db203b5e867c4c78b8aa54feef481ed1b4e7b6b3209b4

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