Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc7ccb7e85ee21…

MALICIOUS

PDF

77.9 KB Created: 2021-09-24 12:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c14cd06894d9c72fdb66f7363361efc SHA-1: be2e5a951f918fe1f6821bc5a16ff3879116bf96 SHA-256: efdc7ccb7e85ee21724e81432841f1e7b41c883e3c0702f3eb5a545e86cdc46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and is identified as a link farm hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=bareilly+ki+barfi+full+movie+torrent PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7359225a4---20127894674.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/moviwejuluvoximakavofokiw.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/kaxisenumulavelapo.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/pamojemizakabotilelepumet.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139f75196b6d---buwekitiruri.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/zelefazopitip.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zagawonuradigenojubikukev.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e61d13f---jovapemogunutofali.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bevufeze.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lodavi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d317f744a1---35956153662.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e5cb56ae---kugomokajudesivunej.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/nuzavuxonolefopoxijara.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ebbabbdfa---seweduxudigutilevoza.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614188fdada2e---20368491481.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/17147843674.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gisewawuk.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/09225436c02392d5f23a0fabe1940134/nodonudatogusonekanobo.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/niboxap.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/20366275468.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_14B1930F766F8A3C.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/agnp8ijhrknsnca1mt0nnni46t/vejujejewugikepixusamafo.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/safojibexete.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/xojimurogejefe.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/22015666798.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_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 17548 bytes
SHA-256: c44e4a2ef1a0f23684966bc15dbe4de503becbdeb3cc63685d9d5121aeb7bab5
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 10772 bytes
SHA-256: bffdfb9e0d35abcd1862814a3f7d1e5bf135ee6c49cb385ea1a8aec133455831

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