Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c876add2eae497d…

MALICIOUS

PDF

91.7 KB Created: 2021-09-02 17:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee5df9a1aded16405e19df49f96048a2 SHA-1: 25c22572b19a9f6ee46688bcede01ab361822537 SHA-256: 0c876add2eae497d68056443d1ac3bf4de8d0910c9fecb6eb46e9ffb5cdfbec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pistant.ru/uplcv?utm_term=odia+school+book+pdf+download PDF link annotation
    • http://aostavet.it/userfiles/files/20922359601.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/6553519006.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2c39fe0be31f3c98bd808337e51e7d3f/59168736532.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ke3ngaofq624nn579vk8ei9sf1/sixon.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ffc85fb84---906979628.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2a3ceffca8088137e656e637da4a18cc/58993264340.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/68298300512.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/96017248868.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160996a01ee679---pedadedetelirivijiza.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/66554854421.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/21857579821.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nusiwonugesodufiw.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611afb3b653ff---zunovodatam.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/lonajasimibomuroguxomixo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/mimuluwimapefunosemepivi.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/73813728066.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/gofalipubo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b90727c11c6---zapigalusodiraloxato.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/7170516056.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ce9e624d253e6ed04aa39c538e9db21b/xiwapegizubeximoparizin.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fc005d9bbd5620fb0e00bfe6c3be91b7/68275298324.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58097da2d---43831052294.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/xabel.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cc98193dbcb---lolurotugizutaseloda.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 22488 bytes
SHA-256: ac5cd7af64b150d25b59251911bbba1c19e36e05fefaf2ce513de77b4e542615
font_02_sfnt_off000148c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C1 10728 bytes
SHA-256: 5e767ea2e7bd475b51949b99ecc39fd614dc1f6b1dc323b238e406342a9c68e6

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