Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83fdd9fe48d3d64…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 21:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9d97530b16f4a9b6ba8e52897b10ed3 SHA-1: 843bf2967e38ea718eb1ee9bfac560c2fc5eef00 SHA-256: e83fdd9fe48d3d649119bc88f7f1599d7608d604a7357fe3b0d165b9ee38ccfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites, a common technique for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links, many hosted on compromised CMS platforms, suggests the document's primary purpose is to redirect users to a malicious payload or phishing site.

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 https://schlosshotel-murten.ch/userfiles/files/zeridu.pdf In PDF document text
    • http://mjacz.cz/soubory/files/49465658830.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/75511517451.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/535fcd1eab829796d5632abcc24e8ad2/zevakezuno.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/49867889445.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611edd1049626---movurejuwuzi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zosevupeg.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/27672960238.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a9fe99e498524909ee4d2fa462ef6069/6444430842.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/fobipebigovedubane.pdfIn PDF document text
    • https://digireg.it/upload/2810169642.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cecc54cb3c7415be3ef065ab4cc075a4/zezute.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609401239a8ae---98904469724.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bee4c5764---96777757794.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/13cb1d51093b836f6f73eae62c8795b2/91338589123.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/47910783369.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160812c18e98b1---43684665938.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0da1b3c0d81af237cd9eeb15490d2e24/83763448813.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/xeziturowawex.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad94da135---wuzozovateneruluvoxi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/32odopu34efm1mp0jbdqn85hp1/26394689370.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/048b75f938841e75a9f28f0f67e6128d/mupopakilazujiza.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/62640410785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=affairscloud+pdf+april+2019PDF 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 18404 bytes
SHA-256: 827ffdb5c1308a4ecaf9f7e807aee20312e36b3de1a083e037cf747bf7ad20a8
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 10824 bytes
SHA-256: 990244a8a18f0ca86cde798604a9c39cab7a0b021b298e8ea971870abeb766b2

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