Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16d9310e46d176e…

MALICIOUS

PDF

92.4 KB Created: 2021-08-12 03:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d380fbe379cf2ff9d9938448f8039f70 SHA-1: 546c59d0918645754d2c384b05ea19b59544bfb3 SHA-256: f16d9310e46d176ee28d8611c679275674126aa650ef4d05427a40ba69a688c6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, directing users to various external sites, some hosted on compromised CMS uploads and disposable domains. No scripts were extracted, but the primary attack pattern involves luring users through these links, likely to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3573f4f4---6389406330.pdf In PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/puxujawaz.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/4110739532.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/fupopodu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830d3bebdc---dupofetopiradezivuxase.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/5366690976.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add37be7d5e---33384921222.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/krs1veru9bjl19eh3k0l7lluq1/mapubowipopizalidadev.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4eadb6c3---vuxiwesurizetibup.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/89394943236.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b626259027---nekuvaropuvokofajuxumavo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ra8dc87gljndjul8nl8otg0hoh/82537669805.pdfIn PDF document text
    • https://argumentua.com/i/file/92260813668.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2g2uni67lo968nn42ms6sp3gcg/5678655440.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///taxixagu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160727c080860d---28373197011.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/72908292905.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609477f9c9484---18619282878.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/37621540766.pdfIn PDF document text
    • https://goldenapp.net/file/fomujozipexow.pdfIn PDF document text
    • https://hgb.se/filer/file/vusegofenilijoripumewegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=baby+growth+chart+calculator+breastfedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 11052 bytes
SHA-256: 1b5adfbea5d92e6134e1e817376aa9b429321144038bddc5b7505158565c068f
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 17208 bytes
SHA-256: d0b8bf1482f2efdd64c28688ac6bea0c871723a7b50918f7c372862f8d40e30d
font_03_sfnt_off00014d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D22 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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