Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f2ab76a924c490…

MALICIOUS

PDF

67.3 KB Created: 2021-06-24 01:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e2322482ee28ca22f2e3d778a059e85 SHA-1: 582ae6b4e5b57a90653cf3b1ffd179747b382861 SHA-256: c1f2ab76a924c4900b1734df935a2ef7f0e4d8fb57866d580de2b6716a47cce9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nhanloc.net/userfiles/file/bekitodugokinoket.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/92ee4ff1090dd1d0fa846c2190667401/49929400894.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/fezidugotekifotokaxedo.pdf
    • http://alnoorcity.com/userfiles/file/23418912270.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/311mtnpn58rn5044345mi0p94troisr0/zaregow.pdf
    • https://usssecuritate.ro/userfiles/file/sugaxejukepogomamerudo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f4c2883---64755426820.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb53d00258---someluwezemeterexoti.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37c1b0885---rilegitowegede.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tj6m5v0qcrf8hkhp7ulh77lg7c/40009611253.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d47e75362---gudor.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/84ba81244d0ae6d323d1d788c05d31ce/nafusekoxilego.pdf
    • http://debden.org/userfiles/file/fumazababodironatelepo.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb47e575df---56262377966.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719734ddddb---60739925273.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r5bo2k1l5iml1i0m1toigko5ci/niwuvi.pdf
    • http://ciaooo.ru/uploades/userfiles/file/damilo.pdf
    • https://nikosdimos.gr/userfiles/file/25149331652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=triton+t80+fitting+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc7e.bin
97934164d5dd9548f5988c1a3b52356e62c97c6f22794ea6e4422b6d789d7958
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 4856 bytes
font_01_sfnt_off0000cd0c.bin
b15c2480fb1b101037a6addd20196aa6bdf9af1060abc680792098b48882572a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 10820 bytes
font_02_sfnt_off0000f1d8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 4324 bytes