Malicious PDF — malware analysis report

Static analysis result for SHA-256 f692197170452cac…

MALICIOUS

PDF

82.6 KB Created: 2021-08-02 01:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c98681b24f363bf595c061a6679c75e3 SHA-1: b14c837369071698bcd5a65743dee2a022b7cd6f SHA-256: f692197170452cace1d97c8aa61d3905e5b8b3eb7ed13b3fef60128ab7b2bab4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=cfmeu+qld+wage+rates PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3326103ed1cfa361866069a4f60929ec/15375751734.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/zuvubojoxifeno.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7056eea3573b112b551a8aa02eea029b/fenagikodugitemoro.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad425294ec---12813672624.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/8440881488.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/gikelewafazopabozajakum.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f152ab848b8c3c16a2fd37c28557b13d/59662862493.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c0aa96fc8---botaxalitopogokoran.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nomitumixugoveki.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2i8vio93t89aa3e40jo2q7q3of/57716217088.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zofakoroximufeduzaf.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fuvafadojaliwuk.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c386bea84---viruziloxifapozewinejavin.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/15709820082.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3c1afd732a5be33d16f17120112c0bcb/28041563204.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/im0c4dmtaa8qhoa789t6bq2nq5/puwedavadovizelunom.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/lifusaxodetopa.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/raxisojuto.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/30860077998.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8e42e1ba---tewova.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mhnjos754h2odsfc1f7q3kt9d2/97098603391.pdfIn PDF document text
    • 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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 17716 bytes
SHA-256: 0b2fe6438320a8c141dffdab6c3dd3202a4dccef6283690cff3d69b22ea5b153
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10744 bytes
SHA-256: 548eef81e8b7487a7c1eb5dfd51dba88c282972e685875b3bc7d47da7e12decc
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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