Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0e95d59fb6a0f0…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 10:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9f17ea437f6382553d889a873da049a SHA-1: da16abe4f1d97e48b96ff45e4ebefbd5a8b897b7 SHA-256: 8c0e95d59fb6a0f050771855c4b70fe95c269c658370c477601ad8b8740f7c6b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7r8ma8c3sd41j657jt6n9su9ok/39641486033.pdf In PDF document text
    • https://nistd.in/userfiles/file/86312778126.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/57407197042.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2a45a4a6eb9941541c8deb755867e534/81703542099.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/56289252863.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fd08acd262b46833109aaff02f557ce0/wirekexegi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a5e35235fd186317f0e8f8f7544a8453/deduletatexobulijabepe.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17546263796.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jqoinv4t9h4i127c06q1jr5n5u/21595846894.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/29982761144.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/88446401808.pdfIn PDF document text
    • https://camelcarpet.org/d/files/25634094016.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/38d4dd3cc3d5fc229f68cc3c9105b0f9/nojidamuwuwemarejuzimaz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e92c82772---bunezelibiro.pdfIn PDF document text
    • http://salt17.com/userfiles/files/91881217373.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/80047716995.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/71130440706.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16116d686f2af5---18699086052.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/forewaratas.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e21ab285d---wevokovezaxagobezisa.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507072041_821287053.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fipajomakedutowujobufeguz.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/34106822806.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a159a938---rixododubita.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/lesironewajesamuk.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a85894c9---35042478460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+tropical+dragon+in+dragon+cityPDF link annotation
    • 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_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10712 bytes
SHA-256: 5071f79385ae63e8a506f5972161dcc5f794c3c2cedd53e48fe0c87475bca7c2
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 19376 bytes
SHA-256: 869beec62eaf073666a32ade620687b64f5d0233b3f2720ef8f6372f1e498cc7
font_02_sfnt_off0001453d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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