Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac5baf9e528e191…

MALICIOUS

PDF

88.3 KB Created: 2021-07-05 23:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbe35140d1e78ebb466a11a746c6e06f SHA-1: 0ace399f4f31b8f86d1d68c8409686c1643a2dd4 SHA-256: 4ac5baf9e528e191ea739eadeadf0f8b713bdbce3ce5aece10c94e191e0b0b51
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing attack, specifically a payment redirection lure, aiming to trick users into believing there are new bank instructions. The presence of numerous external URLs, many hosted on compromised CMS platforms, suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=bank+account+closing+letter+sample+pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6355b9e56---23826602132.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/16ed5988c654d965ca85946101a5dd55/doperidijanamep.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/83502263057.pdf
    • http://copy2d.com/ftp/image/file/wedomorurebema.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7qjhrv1ttchigr2ai1lu7g5eh1/70051649039.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b666243197a---56005065597.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p3sqjfuukhhbt4f9dg4uh95a21/66753328985.pdf
    • https://asthasupermarket.com/userfiles/file/38052446191.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5fa4f544---67139210712.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4d7292a0---japerevuforaxisojidosuze.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/35e906d92f5ee5b2f1f3cd4236a4dfbd/rejipum.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/90391027460.pdf
    • http://allnatureint.com/userfiles/file/jategadazapa.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5b2e079b67451c7d4a495d9327c7c128/36526704329.pdf
    • https://agatanorek.com/files/file/41538988785.pdf
    • http://remont-elektro.eu/archiv/file/fevomilimibidovog.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4s951lj7dc5crtsigro22uritm/pilexoxev.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11737589d3---73964928458.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c54f57a21c888f74ea62246de70559a2/maketeridunedodunuwekos.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0c40437a---27429106946.pdf
    • http://xiaohecollege.com/d/files/84923011573.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d377be1818b---derogikanipake.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-19/20210619005209281718.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e0.bin
414d8ceffd744f21f5073feaa1f99a0aeff267ac8e609143e667e1575c5b0377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 17188 bytes
font_01_sfnt_off000121aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16792 bytes
font_02_sfnt_off000139c1.bin
9ef17459125e5061eeff5e01e6d90a8d5b4cc3ddd716e1cc4dd4c1572b26de2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 11208 bytes

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