Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cf483c483a1160…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 21:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc2be2b91e74b25a030a7331ca2465a6 SHA-1: 2132e85eeae0137063a6adf4478e933418b1d55d SHA-256: e7cf483c483a1160e18bf0a14843d45794cd4bbeb83e666bc3a8e2ae33759122
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The file's structure and the presence of these links indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://playitdirect.ca/ckfinder/uploadfiles/files/gulugujedupit.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608706c7bf332---6093021383.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e777abc426c78a19fb3bf5422b755dea/motunosupubavovinefe.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ef192fab---86644814697.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/20413f74ebdee8613634e9b7cc26d4f9/suvebu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/fujiwemod.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/86358482768.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/91237133145.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tanvhgamv8kvssbrj1ql9slpkv/xinejirelonuvipozik.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607633779c5ce---mibuv.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/61956821721.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/bafekizolavezabuno.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/78592873407.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d2fcc4a3f580d7c3cd8be92672c3ea77/98359027075.pdfIn PDF document text
    • http://mopron.ru/upload/files/588543642.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210814094140.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jidududixonudipalu.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/sowebuv.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fevitofilenenafeku.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/72928690827.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/9031470323.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dd6e2cf2---rosudofubujifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+prospectus+design+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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10740 bytes
SHA-256: a72787c46eaf7b120f6eb178e1bfd97a914e9befbab1e90914f7c300d97ea522
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 17344 bytes
SHA-256: 8cff8011fab426a3d62cbcc05568453be8ae9725abbcb2084d1043d26b09bebe

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