Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fab0c09e55f379…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 02:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2da6983b50b48bc8c1632848dc11fc8 SHA-1: 77d8e346f3d4ec91fd5556b006ef8908a5e3c8fd SHA-256: c9fab0c09e55f379990a2394a9f067d5cab97dde2b1e9e352a14ce573a0ac885
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of a link farm and the use of compromised hosting suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bielwod.com/userfiles/file/55843049890.pdf In PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/xerujolona.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/16664905925.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/nuvododujulajodepofu.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/raguzil.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c04379bd---kewawarezotovelavibudaxe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/22bf48750c3ddca5091b7f385a17e43b/sudus.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/kunizome.pdfIn PDF document text
    • http://stefani.cz/fck/file/45943916688.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/95226163018.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/fevax.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/nukagowitovezaxu.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/nolojuzaxeges.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/kirafuno.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/39430e966d336bfaeaf2e1b931a0d309/16862859486.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/pivodidolosunit.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/2925279192.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/dukapemezuteloturejab.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/rurotevekuxenawilibubu.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/71912473878.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/34870588470.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/gugakafikeligilivelu.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/65523571175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=call+of+cthulhu+7th+edition+keeper+rulebook+pdfPDF 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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 10964 bytes
SHA-256: 41a227f3ff6c9ad9aaecd5903271bd778485892060afedeb5ced8f69116fd186
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 18180 bytes
SHA-256: 2a1de0f5820706fa92ab312ffbffff7066c1c05bf7b02c393c58f12d821e9245
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1