Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3279b7f60d9d7e1…

MALICIOUS

PDF

95.6 KB Created: 2021-09-04 18:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d434fd87140a1cf943c9878c73c073a SHA-1: 164045becb29394892ff4c27d120d14bb33a5800 SHA-256: a3279b7f60d9d7e1971c9af403d501240df6be7b0dfa7204d6caba8579ac76dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4rlas8eg0bnq3cu99mgs4ca6av/xobadeneruvugevobekilu.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8f8e3c78---96538143710.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/67270902513.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/9553892843.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129db694b942---82659754369.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a2e032508c6a3739c16d42fd932bd7a7/daxevujizozulitinibi.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/jafevubi.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mupusixogiwiwugetopo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/legetitosediluxaxodebizi.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/56384711541.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/28667814475.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f737f1674---87604833305.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4691f7pc9k480tk0qpgo2gg064/xevedubibidulixujevibu.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/39023428859.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/fudukusibotokebav.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0dfc787677ebdb77d8cf977dd39008d3/lafosozotikowatumuvim.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/xilebidatizoninoroxoru.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ee607e66eeb6edfe907746f4590616ed/40475588309.pdfIn PDF document text
    • https://noddy.nu/images/file/timewunomowivoxut.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fc0a0af1b91e12a2bb2effaf8deeb114/bukifalorigibamunojemoka.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/42317693147.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775036110f6---15849691901.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b30bd79ac4---43552279896.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/74989386725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=capacitor+datasheet+pdf+downloadPDF 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_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 17140 bytes
SHA-256: 5f8e71f01e7a1a8159e96100c2fdfe11a3152a4b6795029136e2bf67edd3dd39
font_02_sfnt_off0001574a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574A 10836 bytes
SHA-256: 69baf16ae74c13b3ade67978c61ffab36d0b6073f5f5692ad3c5798323776d1b