Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf048e262f07e09…

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 23:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3afbd64e921a5aabc876c1cd88a7242f SHA-1: 56c24cca7f41fc0450ee38a2e283ab7a9fb7b2b7 SHA-256: bcf048e262f07e0913d657544ccd214de13ba1166f182f319ae7d5de919ff446
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan detection. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3528

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://queure.ru/uplcv?utm_term=fra+hours+of+service+compliance+manual PDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/848cf650dc592d5e96b4f44d09d359f7/23094260878.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/poruvunafimatitinaxujek.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/koruxaderujobemefexus.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e3ce4499---novokero.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/12868894968.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8d21f41f---xolavijuwojopewukule.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe2fc3ef68.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jitojesifusofemize.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9806508e3---13705633917.pdfIn PDF document text
    • http://esistore.de/userfiles/file/9466237653.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/gitutufamodapekirugiwa.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4349b537---detovefedewumu.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/94904100350.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/wibibujubetil.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/doweriwalixibevamajit.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6d0aa839---98936331488.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e71c0b842---22374525412.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/menojinotakoxurikovufoku.pdfIn PDF document text
    • https://grnca.org/img/files/files/rujizadefo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kk52lj268ouui6v0boe4srhkns/12934273648.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/mojuzuz.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/95ba06c93293b557abdd20b44e5503ed/xuboxew.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d90df8f9e3fa781b1ec6ccf4e51a5ea5/33085573013.pdfIn 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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10792 bytes
SHA-256: 8ad763307a9c343883b3ddcc151fa76fa0ffc65034266482caf386ff07b7187a
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16884 bytes
SHA-256: 0e98fc5403728bf811e0b3f94b8aa16499eaf6a6d21b766463348bb8b4f33264

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