Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4412610fd4796bf…

MALICIOUS

PDF

91.7 KB Created: 2021-08-01 05:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4004dfef4adc0150b4f9a14102dd49a SHA-1: 2f95681f0b31adbbb3374881c101db7f612b6e19 SHA-256: f4412610fd4796bf687f89a706af14326631c357cee81c349177a4dbf5c62778
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://archism.ru/uplcv?utm_term=best+free+gps+tracking+app+for+ipad PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/dunaoest99f1ekjuvcpaf6dtt2/vevotoxopar.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af552607a52---59687590979.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/jesadux.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2d30ef32c---lilavototaborawi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7f549e6a4b62e5df63c860ca654ad1ee/wodijimivifatam.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b823d6329---85788176299.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/wugisugagodopozivujilu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/78167204338.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff9777fb7---47669352908.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p2cji2mv4uk8sb4fjctofl69k8/bulugogagawajerogifezugo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa8157e34---34585690062.pdfIn PDF document text
    • http://livilgirls.com/files/fejikakagora.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/19362901436.pdfIn PDF document text
    • http://msiutilities.biz/documents/9651704105.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/vapalipopuxelebikalizav.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/60580217116.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075289de8f35---zesimufimuxuwipapaxe.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e03227f13---tasirafexuve.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b3451d679---zonodoper.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee800c9eff3---dapojerunugirulegomiwud.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63784192127.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ccac5a9bd---23481595161.pdfIn PDF document text
    • http://innotack.com/userfiles/files/15231578237.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f396cc4b78a0377a126be4c81cf09a49/jitijinovavoruneme.pdfIn PDF document text
    • http://firegallery.ru/img/upload/dorijerunitopogivo.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/poxodutetuw.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_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16808 bytes
SHA-256: 2d4c582e1665efb733f163dac7f1fa5073c8f35bf6e342b7454086bc05b8de74
font_01_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 10892 bytes
SHA-256: 5eb80c09203c342749301577ffd0dd888917e5c8880c707f706aea633d52c0ec
font_02_sfnt_off000145d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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