Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4f5b943c7915ff…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 08:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6a46c553e973216dbb9095840e153def SHA-1: 9408c0ae1628e6fe7a05331bacce123fe6e9ca94 SHA-256: 0e4f5b943c7915ff42b38c34a7d4d5a079439c5274b4a88f4c3787ada4e52b99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=difference+between+cross+join+and+natural+join PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2rvq5ak07135prgn2c0gbn7du0/41185694593.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/803fa5d2e88321558ce93e269fa68f49/kamedilonipa.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/genufemebaro.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/28446743002.pdfIn PDF document text
    • http://goref.ru/files/file/23697962469.pdfIn PDF document text
    • http://djapm.com/userfiles/file/42227222432.pdfIn PDF document text
    • https://airshow-bg.com/file/71451823566.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/68313177817.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afcbd1ab9---25423402998.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/cqdj8j6cvho0iu9jpsltq5khht/lezodesalolu.pdfIn PDF document text
    • http://irths.com/upload_files/files/65824939381.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/pekikobefenok.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/96464777824.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/461b3ed4378b5962034dbc5efd60de0a/wugituvogixavefamu.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/79457993475.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/vejotirugasepure.pdfIn PDF document text
    • https://doitoutdoorz.com/file/U6lK1XTxc8IKpDvH.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/2356663933.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/58768055734.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/f8b2cfb628f8e4dfd5e23447ac48683a/xepavogebifedifogivas.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/19060503204.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2d9053752b7d6e3bc0df125327c78b6/nugumas.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gifozorifutik.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7a8c610c801296b864120f6a920ee245/46233585439.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 10924 bytes
SHA-256: ec8d9152d80313940f91c70a841e7b3ddf038f697285d310616a38a53c91d473
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 17028 bytes
SHA-256: 0703341da40994e1bf40ef9c62d5ec00ee8f3dec42030ee1cc1bc13fc0038e4c

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