Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5439a74bd4abf9…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 22:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46d21331d44f58bc9e7347bdb25d4872 SHA-1: d17c1a47e820329b3c0bb888c5ded801a9a078ee SHA-256: ff5439a74bd4abf92de40249bee155eabf1abf88803ed551b47549b6d7fa5fee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable domains, forming a link farm. This suggests the document is designed to lure users into clicking these links, likely leading to phishing or further malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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 http://cka-shiba.com/ckfinder/userfiles/files/gugupitoninodilawi.pdf In PDF document text
    • http://musclecar-taps.com/js/upload/files/81624616023.pdfIn PDF document text
    • http://debden.org/userfiles/file/21548290981.pdfIn PDF document text
    • http://teplospectr.ru/images/files/54571150016.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/zerugabosapomivevexi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pemipedenubemokeme.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/pixelajeludi.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/64204197796.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/64339826494.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lol9fr9i9sgs6869aic8dv70dg/36222617986.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/50471980581.pdfIn PDF document text
    • https://campermagazine.tv/public/file/kowenurawurolifusos.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6c87698f2f3db72871d145fb108e08e9/82560276848.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1660bd414---23270463723.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f6880b4a7---4248850508.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/nerawola.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33999706640.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/sorifogegoxiguv.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc7fd99e26---6204095063.pdfIn PDF document text
    • http://fourfoods.com/images/files/72692813164.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/37638280692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=livro+genetica+thompson+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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 18272 bytes
SHA-256: 4a534a0ce78e266744117a04189407b4848ef6881883e0f515d1c8452ccb1e96
font_02_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 11044 bytes
SHA-256: 75ab5ade1404d769d859efd7523823a6ebf5893086090a6447f60d4734e858bd

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