Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e17d01ea52bf52…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 14:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8181e2106ee84ffbf423239de38d3ffb SHA-1: 3018ea165508260db00ed716861df356af6b8682 SHA-256: 72e17d01ea52bf52456a21bbf6d50fccb32c92e63342871ff6d9f60b69d10892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on potentially disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://assistance.uz/images/shared/file/80757143434.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6a67215f---vezezusebewumokusezelo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/16959618213.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/sojaretavililujel.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/3736077537.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/gezujexufutuxux.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/866kf6t4f4ktjl7d8m3fpkd838/81773500269.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zofibosaxibuvivezil.pdfIn PDF document text
    • https://birudongker.com/contents/files/87210265335.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/55385092675.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210609133200.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31ccfdcbb0---33685361722.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e9da54cfc6f1a71d30c56b6e1dec5e6/68609021708.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/55997023060.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/wupugupijesadimamupamizes.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/12621512054.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cnvbtp14dvm9eqij16hrnec095/79670422780.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/42586282664.pdfIn PDF document text
    • http://benrassam.com/uploads/files/dafeta.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/mivol.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/71235697776.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/rerilimu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4e54be9e1f659efc197e31a5bda9fde5/72288467311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=employee+attendance+record+pdfPDF 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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 10620 bytes
SHA-256: c8da73905afa1b783b3aac1386b81cff3201f4517c2208416d51949c8178a770
font_02_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 16696 bytes
SHA-256: 7d80c2c61513e3531e8f46287985315ed347066a4f518e231f314a7fe85c0094