Malicious PDF — malware analysis report

Static analysis result for SHA-256 603899abc8d037d1…

MALICIOUS

PDF

142.3 KB Created: 2021-09-05 21:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a24635d5d32e0f6e4881092e278876ad SHA-1: c9dbee2a75b0a4fed92234b4ba0a604152ab3f87 SHA-256: 603899abc8d037d1106091f822a81f0eceeee57727efbdbc8bc5edcb9139ec04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links likely serve as a link farm to direct users to malicious PDF downloads, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://dhins.com/testingsites/advantage_aviation/assets/media/file/bijizidapasaputa.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cb4aed482c---44571171442.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127675f704e3---domeguwut.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610612a65cd1c---sulobetuxopipovagado.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/14741581139.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/185dc4dd000756a57abd08c7962bc950/vikurifuku.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/29156753886.pdfIn PDF document text
    • http://metallpress.ru/files/tazeganukepesuz.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/64517997566.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/dukavurugiwevexuvamopape.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/41456650837.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xukojo.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/6lgji9egfrc9j3vusf24i3por2/gitofuxaxanem.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/52115126433.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/gitimepozameripazunudup.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/mugilafibuwevonemota.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/81565530312.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/64502706668.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/95207908837.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c7c60d73c916ec0cf8dbeaa13f733b5/movefafupujaves.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/23375754552.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdba49c48---4769485006.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/zedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gettysburg+address+pdf+downloadPDF link annotation
    • 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_off0001c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5D0 11060 bytes
SHA-256: 58ccb3d4b1f457b56fceb9068ae9e81a8247a926c3c653424ce338e61b950a6a
font_01_sfnt_off0001df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F782 19756 bytes
SHA-256: 3e2c9b55dd99bc7e7b58dad36b3713f9833938dea51ea31d6de6884ee652a0ca