Malicious PDF — malware analysis report

Static analysis result for SHA-256 873776141cf4332a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 05:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e64df16098613c60391eb47df36f3797 SHA-1: ded0cc8c8dd23b4f031e1dd0281c4ab813ad411b SHA-256: 873776141cf4332aabeb11aad3369fc0cdc2605a486231570961968dfc50f719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains hosting PDF files. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=the+hunter+3d+hunting+game+for+deer+%26+big+game+apk PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302279ab9c1---80247576700.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/36277738714.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c46f092a28---fepixisifolojoladevaw.pdfIn PDF document text
    • https://proxus.nl/file/95037428142.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/94876084631.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/85580816159.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/4707231801.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ddf0eed1---kukisutizosigujato.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/15808811928.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/36848063140.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1585ef09---48222479687.pdfIn PDF document text
    • http://mgrima.com/files/file/68068507636.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/sajetemitazidudunidedatab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ebed006e4---tajimuxab.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/93402724713.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/pedakojenowetodizeraxe.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/70214026309.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/78709126001.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/liviwavejukesor.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/57242334580.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/kasipenodisegewuvo.pdfIn PDF document text
    • http://www.centralperdana.com/file/18929365043.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/20aa3942559b823d82a8fd1a913a4356/zemolekosoj.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/97188693883.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/xaxojonojuminojironax.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/befotizusade.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/jezitadivosuzogenux.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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 10820 bytes
SHA-256: b74fdf2c058aeefbe6041cf5bb2aeee9a20f14ba7de46391cdf41184ecda506d
font_01_sfnt_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 15064 bytes
SHA-256: 484897fae87d138b9565b1724096cf2ae774f44f477f147849fd546534c8e073
font_02_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1