Malicious PDF — malware analysis report

Static analysis result for SHA-256 0829d255853ae2af…

MALICIOUS

PDF

150.5 KB Created: 2021-06-28 07:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcfae5a5f22342a30cf6f2278b4b9fbb SHA-1: 031c430748f5ea0e68b92cef558f9aab2a89250d SHA-256: 0829d255853ae2affa414e2018b8b810122839a8bb99a91a65771a51ba555d00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9339

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://sjalikave.hu/pictures/file/17252808431.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/u84u3engt85vsq259si1svr2i0/22208716251.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082da967fa89---19120392547.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b61e1a397---28742153616.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092a122bc6ae---76550007543.pdf
    • http://alrabbancapital.com/file/files/78579058276.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4fb9f114da982504d4e81b1ecc6c14bc/77253009958.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210528200856.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/39a77c0e62f8bf98c11035a771793926/63810081380.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c763325866a7430b23539b4b363c0c65/lofanimuxavujol.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/868e8ea9c9aed2c92afbb57a5d6023be/pidedoritejuf.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2889c4f65e---55885385350.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b035ec6f---fifufeliw.pdf
    • https://almuhja.net/ckfinder/userfiles/files/kelabiduberozaxuziwafe.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d6d7c0384d9a34f5e2ed8fe7ed08e370/23303810627.pdf
    • https://arab-hams.com/Ups/files/6832443080.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1253d2d4f3c66da9360a59104aad9962/bisotijopu.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0e03ede153f3b36229679360ae5b760d/wutad.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d7662363b8b99af8eddee5360655a76e/93104139515.pdf
    • http://kojeneckezbozi.eu/userfiles/file/wanujulurejigadosesamujo.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/gokutuk.pdf
    • https://kodcomputers.ro/2664/uploads/rawusorurufoguxemiket.pdf
    • http://tieclangman.com/Images_upload/files/2696750774.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a6c8243fdb83e8b27ef5e336de57f2e4/5149228658.pdf
    • http://group-anons.ru/userfiles/files/26393880608.pdf
    • http://ketoanaca.com/uploads/image/files/kixutejesajalebara.pdf
    • http://korean-school.hu/hangul/userfiles/file/39948884280.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=unnamed+aircraft+system
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d5c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5C7 16792 bytes
font_01_sfnt_off0001edde.bin
ec65824796024a41b788211838d48af00159bb90dd4e6e7b1acd041ade67900c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDDE 10592 bytes
font_02_sfnt_off000205f8.bin
14ab4abd883247c8e66191bc5cbd6386bfd826995898d035c7d540d081753fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x205F8 5700 bytes
font_03_sfnt_off00021a2e.bin
56b0465e7b50e55e23366d7a22ef63df7342e03c262e22e253da91eae3a6c2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21A2E 18928 bytes

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