Malicious PDF — malware analysis report

Static analysis result for SHA-256 906217be95172ecb…

MALICIOUS

PDF

87.7 KB Created: 2021-07-15 23:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c1428e72bd9c133e208bac9694ac8ea SHA-1: fa3ddc7d492c98fb7e3bc0c13095da05a796e34e SHA-256: 906217be95172ecb08f93f1bf8324bdeb75e40dee38362703c62f82c7775a33b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=holy+rosary+today PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441392c97---35160815653.pdfIn PDF document text
    • https://melz-feu.ru/upload/zutemikukez.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/woxavigeperogiwadat.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e223cb390a1463faa62f8f5eda4add07/52478619610.pdfIn PDF document text
    • http://fittbike.hu/files/file/59418787494.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3f4b7c61---34650191414.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/763440652.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/finaw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eck9l4ktfij44jgj00i1eum2dk/wobel.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80031062294.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zifidazodukivegorazu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/94235de0892ff2e71a1e9cbea4cf6803/81564157447.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3936080995.pdfIn PDF document text
    • http://web68s.com/upload/files/56561224743.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/243ca16294f373132561986717ce6b11/vipepivomuranixixetos.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gaziviwifapunifoviteju.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/72232823470.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/94b73g2up8seqfralt92sevu84/31284580865.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f23b684a2525b28948e46e27cd04724a/94877604600.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/75301569883.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fegevejipegobotefozij.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/xamopafonobufovafi.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_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 10016 bytes
SHA-256: 82626ae7608913a6b5d5dfd987f06d68dc8614b4d488f88fee392270fe17510b
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 17484 bytes
SHA-256: 435a74d7abae69354edd96f6aef0020e68f49773be882b2148209fd10fbed955

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