Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5ffe01dae6f179…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 08:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a4b7f13dfc517ac5318cef7955bdf8b SHA-1: 632bba5046c22bbeb928112901ce346e3e9c73b9 SHA-256: 7a5ffe01dae6f1799989637245bdddba4212b11c500881da1fcfd59acc2b401b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or phishing for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608461bd8a68c---32524177483.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/g2shs8trrf4nb1eigetigge6jm/vagamajokivazonilifised.pdf
    • http://basaritarim.net/admin/editor_resim/file/47647586771.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/37aed4b87347650d1009471f8ec7d41b/tozagavatidof.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97c2555ae---vijirosuzanorobezuxeko.pdf
    • https://prtl.pl/userfiles/file/47972544221.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7fdcfca4f8b82c628d335499f7f9b05c/84658206729.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57530ed2ad---likeselinubafex.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0ac72q9384hff3isr9npoa961l/87598518327.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea22515cb2---92104295619.pdf
    • https://habibitours.com/ckfinder/userfiles/files/negumomuroxalidizulad.pdf
    • http://ijdssymposium.eu/upload/97142380574.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8gfe4r3arsku1e72ku9e1aq341/fofepezuboguvetudem.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b6ae2860---gipanakoba.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5f6b76fbb1e3d3902355ae62bc62d833/panuxodinatusok.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9cbce4e96---jikalotowaxoligorovujago.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a587a0dc4---21131948013.pdf
    • http://rexant.by/upload/editor/files/86238035554.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfed46ec7522bebab8ee62aa55d186f0/zupipi.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d1e6ab66---39702603949.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/28c9c023945a9aaecaf2dfbbd7c749fe/92457376813.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094938fb9765---jorasumizedek.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/cqvcl6vsj792kgopnthff32t2l/5114297126.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/61013091255.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m1tr6g6hgs69phim69km6gl770/dalusanogedegegoweko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oh+my+god+watch+online
    • 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_off0000e8ec.bin
6c428c86fe4d096acd8a97b8de29c2ba3232feb2e8fd1631afb4666d1da4279e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 17512 bytes
font_01_sfnt_off0001168d.bin
6f7aaac1bd5f4738fde6c86e948d2dc5ca54071f2858fa4614446e44987551c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 10772 bytes
font_02_sfnt_off00012f09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F09 16792 bytes