Malicious PDF — malware analysis report

Static analysis result for SHA-256 24359d37e16f1410…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 07:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4d53a1a843cfdf8d81faf48d634c539 SHA-1: 509a190b5146048a9293d60b0dd868627b5fa746 SHA-256: 24359d37e16f1410cdf67cfb407835e02a1cb9d1e97beb300fe9d292b51e7a92
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbe58ace5---9450542840.pdf
    • https://almuhja.net/ckfinder/userfiles/files/vexubuzogi.pdf
    • http://arohitourandtravels.com/userfiles/file/38533434950.pdf
    • http://fruitvita.com/files/files/13201240098.pdf
    • http://ehs1958.org/clients/73155/File/94794187099.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160751aae9d376---19840768228.pdf
    • http://classicalgardenstatues.com/uplds/file/muxutiluboxuvuvuvugova.pdf
    • http://stolizstekla.ru/userfiles/file/77698421008.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/49860576093.pdf
    • http://katheran.com/clients/55933/File/gejalazulatatusat.pdf
    • https://gerastar.com/userfiles/file/7271282941.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bc15e013---63883115418.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e71b46cd2---voduzilu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66f25b3de---36268934371.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9001ee8d2---74806873183.pdf
    • http://zxpgw.com/userfiles/file/reniradotemeramep.pdf
    • http://haisushitogo.com/uploads/files/38868513855.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f1af03a546e2e7ed21816f0fde101bd2/monuwagakaved.pdf
    • http://tcsklife.com/filespath/files/20210831170208.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d9077959---24752625793.pdf
    • http://doubles301.jp/files/ckeditor/files/damixenezi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+of+drug+abuse+pdf
    • 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_off0000c738.bin
d75897b109bf8c887023e3da6c68e21dc6a704069c56671664943133c2a2a4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xC738 16724 bytes
font_01_sfnt_off0000f252.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes
font_02_sfnt_off00010a69.bin
727459c047a5d98aea3d278e854d0b79630305c816ecbc60fa14f499b10f0516
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 10940 bytes