Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc7fbb6bc5fce4d…

MALICIOUS

PDF

127.0 KB Created: 2021-07-03 08:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c9fe62df1f14c699d7ab72654df5b890 SHA-1: 4f9cc0f40a0199b01ef9e319fa83a6ddd1a31524 SHA-256: 4fc7fbb6bc5fce4d4940781565569967c2910168b116ac7ca80761cc509dd91b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://crewmak.ru/uplcv?utm_term=in+a+competitive+examination PDF link annotation
    • http://goldenpeak.it/userfiles/files/57663876584.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abad220cd6a---11591152079.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13799969786.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/49170636239.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4keat5cug63h7bchib1vn4h530/folafedexedobasok.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/510d04f1a6uimat6ks049teiu2/zizijunaninawu.pdfIn PDF document text
    • https://eslms.com/userfiles/file/lobimevutivenewovazibis.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16092da90c7ac6---kezoxitage.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/lomopi.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/pufare.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/dosafabom.pdfIn PDF document text
    • http://abnicum.com/files/file/81828350636.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/85990954704.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/95406568556.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/disikilovifidiwusoz.pdfIn PDF document text
    • http://brmc.jp/user_data/userfiles/files/sozuludaxerufafejipu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ac0f79904ac9e9df95d5d6c873f11df/gonasetux.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfade42383b---kokusutumeda.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1a5dd93dee89ac402f95104e155007b1/74690482205.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c2c6142098a5835043bfb1238e533e27/dezatuvagezoteget.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hs54tib1nmftuehj3qoilteq41/removivul.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/25459924564.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb8fed4f2---44487017954.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b7295557e1ba53d175596d05aa93ea93/musodeg.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/36941625582.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/859f38b6f9e9889db3258a7694ccd02a/fevesigivi.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_off000189a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B8 21008 bytes
SHA-256: 889d9f58fb301297759f09184049591810f1ddc92692d027389cb2b5c7fc4c59
font_02_sfnt_off0001d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D68A 10340 bytes
SHA-256: bc610cea1bd56a2d3934b2e1b6e4ad899991a08dacab1b913ac444cfc0faf8ed

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