Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff344c50ca9ed8b4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-05 12:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 371b80144c68dc046160fe1bfcc40d55 SHA-1: 5a707d44648d3e6bdcf2d224fdb42d920dcd451c SHA-256: ff344c50ca9ed8b4d2b7e4a48b8be4a01e0c8a43dbebb15cea92cecd140c0c0c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1fso81rvdm403u3ldocsal6a1v/taginotid.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6db8f7cbdc980dca77b2005bc1a05c00/gorudubevuguwuvojuxiwa.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/zukekajimuzotog.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/ruxojumotovi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/bbc3e19eitis798tvfrllsevos/52410677292.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c9f737dd---30822603791.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jixilunumivevibi.pdfIn PDF document text
    • http://mextro.de/upload/files/44707897597.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/35804973173.pdfIn PDF document text
    • http://teraval.cz/res/file/kafujafidimuwi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c398153ae---65435627071.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/pujemelatosiretisuxitokon.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/068bbcabb7c61cfd3f19ce3db424f25a/ladaburosijilamesasagefe.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210613134506.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c7cb8a71512e617255728eed49892812/42555631330.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cq4bo238s94vm9inku3ut2919f/nilararawumalakuwepel.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/0ot7jl6ut4eliolm8qkbkdl20u/58525762776.pdfIn PDF document text
    • http://lucann.com/Upload/file/70571237538.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210702_BD30AA119C4B0C6D.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/49644165741.pdfIn PDF document text
    • http://hrudolf.com/userfiles/18988889607.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/46911932671.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e2b0502646f9e1349c1d717fd813ad8d/soterekibasotavokogobi.pdfIn PDF document text
    • http://toonesk.com/upload/nefebutaxirazugatodusasuj.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/69954599618.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c55755966---92718355456.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5201ccf316---59113066115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=where+in+bslPDF 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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 17176 bytes
SHA-256: 7de56d0a212fc9ae3462974f10b1a965f6a23be29da630a8ee0276bf4fccade0
font_01_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 9956 bytes
SHA-256: 1e27b6bd7ad0908f73154621dce5a34fc3dc3ce9e4390be3232efb3918559152