Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb41523e5fe14e94…

MALICIOUS

PDF

88.1 KB Created: 2021-07-15 17:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecb62b8399773585dd8030925049c5f6 SHA-1: 503dcdc37b8a0f569fe7880bb70f6e482069b49d SHA-256: bb41523e5fe14e94e6bafdc29e16104f0624715395d4ea88f81d05949598e4f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://naturallabs.de/userfiles/file/fudevusugoz.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d1f4b4c6a6---radilawumesuwovaba.pdf
    • http://findmecakes.com/userfiles/files/29589199874.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd25282003---foketur.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607514fb3d22e---58462969304.pdf
    • https://aydin-elektrik.com/resimler/files/58143086797.pdf
    • http://morgancountyoh.com/userimages/sirewexinokemubuxa.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5c9ac49b265ef6e3b60377bc3b28ad1a/87111565325.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3ce0c44083b2d7e1b5e8c298eaffdc5c/67528083935.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609277a7d2968---wovor.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3bf346df6ed21dfd0945878568681cb4/wafozuzekelufavof.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d317cc7a5f7---vivasapasir.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94df4107b8---45260794959.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8amd3b4idrqqlhmjvni9g6v4qr/gizetojodasirawekon.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/paim12cnb51ebbb55cppfkrleg/12235716783.pdf
    • http://www.euro-fly.eu/userfiles/files/kesumowimuxamejipugosoxo.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d8eb18ae---30282790746.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160802c675fd40---bukuvotav.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5afdc6d49---51278889758.pdf
    • http://byty-pardubice.eu/UserFiles/File/zusapufinu.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23990e053---98860893438.pdf
    • http://upoart.com/ckfinder/userfiles/files/dimifovuluparovawiruf.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d15a286d4---14625304419.pdf
    • http://iltorg.ru/upload/file/20839164139.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/orph634lcc55cibspv97okhqlv/kuzuvolatipemoronit.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72428a092---6131416604.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609134d8aac34---xerutosotofamibe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pricing+strategies+in+marketing+mix
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 16792 bytes
font_01_sfnt_off00010c26.bin
106b2faf6f8155aff009ab08a24d9bc8266f0b8ca0aa49fff66aa50e6fb04526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 17664 bytes
font_02_sfnt_off00013a37.bin
d0f4ee6ee54caa6a8435fbdf76ef9706b7dd3b9edd8327b042fd56c697315e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 10600 bytes

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