Malicious PDF — malware analysis report

Static analysis result for SHA-256 21171347f809afd7…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 03:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 02aeb5de533c21e14fae2b69e36198fc SHA-1: f1a6cb395b1d2813468a2300cf1b0e7a0631a33d SHA-256: 21171347f809afd73dc1f3d2c48e590925a9156458cbe1518481157d0392baec
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=expressionism+art+style PDF link annotation
    • http://muzeumostrowiec.pl/obrazy/file/74630590415.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d216c1007---4206031770.pdfIn PDF document text
    • http://yuha.be/_files/file/kuxizunijegisiv.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/08d8925111eb4da517e5299c15bc9343/voxuwixovusuma.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v5ibn9tjobfn0v3m3v6t8l80d4/46255618084.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/378a8giv5l90e87faertufq2n3/17470970120.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b74aa9f9---28574625958.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e4cco49t9r3ef8rju2rf2p143/tirezepomenujojebavivizal.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc21ef476ac---wavofovegatudunebuvemaru.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/564a4b53e7e3d79f9f37d555509e7815/balodedasepafax.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/93628d4c3c478c111569f693696c8f9b/miviwivifuge.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0abcfb43b9---liwafiwunevurazikojawu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eba854b4c---paxizavodunodatinof.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/mifewiwabagobi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/fogelobasifapu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xukalowesilukokuwakufed.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d45a4a6555d325e25eb5371ba5a07daf/2998592492.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061119561548.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/170702324218.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb52c734a6---xupekedulasidapebala.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/zuwefivosodi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///nejesotopogonowusezijexul.pdfIn PDF document text
    • https://pmms-online.com/assets/file/60064988245.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/45400970386.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_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 17228 bytes
SHA-256: 512da5cc2dfd2aec139d84f1817cc7a10b0cdaf2a9abf9742adc61ae6dd32a8a
font_01_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E38 10612 bytes
SHA-256: 605cf7b78d94fcbd20498fa456892bc06d5bd6494393a74ad22d7266e0a6890b

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