Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a9277663bb91d7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 11:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f216821da5e38b85c6fcb98c920fab2b SHA-1: b1e0785103f5a0fa3524d0a047e8283d7d8287ab SHA-256: 37a9277663bb91d7b6a9efc349f9b81b838cc2a9ed2c4af6d7f30fea5d59d104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=pubg+mobile+lite+file+obb PDF link annotation
    • http://rsentco.com/upload/file/74578629399.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/10f7758692f42b843decbf7d79ccc0c1/19730886556.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tipopanaduk.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/zisujenekarux.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/71088695707.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210919034656.pdfIn PDF document text
    • https://shunnasato.com/35449694828.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/sogapila.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bb39968a9b4c24aaf362978245ece520/91117375036.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/86938237421.pdfIn PDF document text
    • https://mkontroll.hu/File/14442341613.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fca59d04c---futovekipimawaj.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/74364265259.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93345245751.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/95405207797.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/45514909669.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/jebudininumulurejubusukot.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/patixagezogabu.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/popixosebimesivoga.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/sotazovezun.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/42336769959.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/80151687108.pdfIn PDF document text
    • http://boldogelet.hu/media/52860146884.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0f7512bec7148c2e871e00e20cf7304d/8925803782.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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 10264 bytes
SHA-256: 81afa05494e1015f0476a36bfe16bb7bf89b9053e14f8aa2294e6f4b48d21a57
font_02_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 15336 bytes
SHA-256: 3345f178ff2dfa80fc0cae348e274c9943e396822dde2378f6a689efc188a803

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