Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe700c2ec3fca8b…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 16:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 702cdf26e233200ae5268874f170043d SHA-1: 8225af544c0164064492671df2391fdecaf3f805 SHA-256: cbe700c2ec3fca8ba47699786c64497b0929627dee065dbe4b7602301183b886
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or spamming campaign aimed at driving traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145c8d0cbb8f---sugusi.pdf In PDF document text
    • http://ferrocom-spb.ru/userfiles/files/99952616098.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/80451294664.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5bca7923---27065450959.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/20663898722.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/14530877876.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/4576127116.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/migubunowu.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xowufobanef.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vulowalojodoxotezevu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/52ba8b3a549b32490633488f30ebe388/63012877202.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/lasuvurugubuden.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/57027483068.pdfIn PDF document text
    • http://rsst77.ru/upload/files/xoluwogafunomudoxu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cee714a4cb5c783bcb82b10949c7af98/midajojevawo.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/6303403049.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/liwafiluzotasaralam.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/29100688624.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/liwopadavipima.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/29000856587.pdfIn PDF document text
    • http://jawarakreasi.com/file/499406061.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nofojut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=excel+delete+rows+containingPDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 10716 bytes
SHA-256: fe43695eaa8526c201841a210c9f85ef30298e626cc231b4810a0aedb5fb3673
font_01_sfnt_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 17060 bytes
SHA-256: 5c8618a2ac185d8bcab017e954bced887a2eebfeee172f0df4e4355aef213747