Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4a236c896f9a45…

MALICIOUS

PDF

81.6 KB Created: 2021-08-20 20:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8298d26b2dddddcf4c68c6d95702f0f6 SHA-1: 804ac39972fd23b45b06e16da6f2d19f16f6d370 SHA-256: ff4a236c896f9a45622222ed84f54b848635bfac86571407958698bc5ba88793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1e901bf7---wisuxu.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8fegn6lkh3qvb8ujmurg87sas4/83114105020.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/57295345874.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484194166a.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8cabfb12---691856452.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4d8b0a45---xazesafalewinubivinitep.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdaf0bcbda---89320596238.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8288f713c4de14f37021f21aa132c9bc/95819621276.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t7njprofl22dnc5qo7cog0kf5l/mabotijaladosazofefapo.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/127121498060a46ea7824b4.pdfIn PDF document text
    • http://24cvety.ru/upload/files/subuwaveviza.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3be01c0b0f1a914cba728195a20cca62/pidajewajoposoledadizix.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p2q49cdmkrlv42nlfh802ebcf2/47141707532.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/93188574583.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/86802477920.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/36479093524.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/64486389998.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/59778019781.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/315e97a2a19bc11882e4dda71d014005/soduliposuzati.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/32931939800.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/xapesumito.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lodesog.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bopofo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075dea4db1c1---dujajotixawidisesirid.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/8997371162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pressostato+square+d+9013+fsg-2+istruzioniPDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 11456 bytes
SHA-256: 12df40e75b3318e663e6946360e9525bd2999606db8b87755865b4b25c363e2b
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 17836 bytes
SHA-256: 26d9624a15a96ff2780c7d5911f24d45d7206cab3b3f7cddbfd6821b8e94c205
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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