Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79f548d74d6fe83…

MALICIOUS

PDF

89.1 KB Created: 2021-07-22 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ef70e1dc592273d11d4509fa790f248 SHA-1: 1eafa3335b902812dd0f67156bc6ad41c7f47d6e SHA-256: b79f548d74d6fe83632619870b65cd4b382407312443c2937b18731490533018
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to multiple compromised WordPress sites and potentially hosting malicious content. The document body is heavily obfuscated, but the presence of numerous URLs and the 'SE_CALLBACK_LURE' heuristic suggest it is designed to trick users into clicking links or engaging with deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/17a5a42e1e14e4f001dc8457eb0c5841/98608697388.pdf In PDF document text
    • https://rachelrom.com/rescontent/file/kozemanegodivurix.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084c17234ca0---76926721119.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/374072cbf699c10a604e7f6f3ef152cd/nelebe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095d27b07ddc---97653750125.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/vovupeki.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/kigefaf.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/34497504085.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa9f0aff9---rewumosumuwiro.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4cdc01fbb7720718333015b52f802e12/kemeguvijibujuza.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160942a6930cc8---36667821976.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/86628468025.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/17654682729.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ea26c978cf5399925ac36b18bf9ff271/60331699107.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vajezufabofokevewusowaku.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9d8bcaf8---raponitugomasufidek.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/kuwiwe.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/3917869343.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3b7ee4c2f3e607b54ed9f9841cd583f6/sigekobajobawatifowape.pdfIn PDF document text
    • http://carszana.com/image/upload/File/laduxakoxojal.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8464c1d9a8---40125265266.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/phuo7uhi1pi0f715u88bsdvm7i/55592627283.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/37166780933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=food+preservation+by+low+and+high+temperature+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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 17260 bytes
SHA-256: e0e3c40a118570c58500e51a7dcd0da4fcdcbc508f392d545c7291b4289578a0
font_02_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 11428 bytes
SHA-256: 4489d208f880b3e48df1a4c30fc77bc43772ad2a957b1cc09067a22fe94f7b96

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