Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62444294c7485c2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 05:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 479eb6ce017ac86e34cb88a7badd644a SHA-1: 126d3b34602a5c66b8b99242f5cdead8bca83bb9 SHA-256: a62444294c7485c2251fd53d2142469f1b7d75131bdbf44f981d0c9751fa8f5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials by tricking users into approving MFA requests or entering one-time codes. The presence of numerous links to potentially compromised or disposable hosting sites further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://demetraproject.eu/ckfinder/userfiles/files/weladibako.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5cac3ae60508571255ccb23ec4d66a6f/gotunafexemeb.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/51645005156.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zazoselila.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b2u6h8n7ismghjaptbaddtklfu/maboviwewuxe.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/13156996019.pdfIn PDF document text
    • http://iltorg.ru/upload/file/79554495335.pdfIn PDF document text
    • http://ned.ru/uploads/files/fibazetiwonofoguferi.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mevubu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/sogipig.pdfIn PDF document text
    • http://altinay-law.com/images/file/33043644463.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e378483f0---31292764493.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/wagoderek.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/053eec89cf251c1d11e94134dc379c23/6800267547.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/razoborom.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///73790346456.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51edaf1ebf---tozafilapokezogudi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/283880c20eed4345e1249d6875d8fabb/42861847102.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/86425500048.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/vunupuvugotuvumufaperok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=carbidopa+levodopa+davis+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_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 18432 bytes
SHA-256: a5d574a022d81641684d095ad5c817d3948752ed8a2f99b7d10b91bfd2e85057
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10524 bytes
SHA-256: eed03b3791c5aba7e624a6f49ebadaf7f3a8a73387e221f075ac7cde5bee3f87

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