Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3db0cb81fe9316…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 22:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb499cfcc3d462f8d20c25a3e41f836c SHA-1: 45ee13510379bc989cf27623f1670232f30431f6 SHA-256: cd3db0cb81fe9316c766679c9e3d9045c303b26d0b3ce09d308fc1abc81b13d3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including malformed streams, a link farm pointing to compromised websites, and a high ML classifier score. The presence of embedded URLs and the heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggest the document is intended to trick the user into downloading a password-protected archive, likely containing a secondary payload. 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 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=canara+bank+pgdbf+notification+pdf PDF link annotation
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/69596e9c4340fd11ad5ca12cbccf1e7a/nekukekede.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lgmoblgsdpdans8bt32hegpsn6/98567834326.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080a76eed748---dozelixera.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/21548736856.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zudapeli.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/81894889486.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/mezojavetosudizaliji.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/7409304423.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/91333987530.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kqqgqr8uhrvnkoqpl2502aalu8/jakasewekiwawop.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4342758faa---dogekata.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b527ed6ff82045b6a0b4a8c749643854/magotudijolutefezezekewa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c2f8ab8e---24365820319.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/fawopapid.pdfIn PDF document text
    • https://dpmceramiche.it/file/66998854842.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/kemozalaludejutemetanudo.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90304853986.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e8aff7d9466879a67767fe4673a2885/93734781560.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608569d195dcc---11421673466.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/12367023968.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5454cc6067---mijibogogagupereg.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/63bcdfb5f8c757d8274b11375d3e1830/37007371645.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49a9ab70a68448e4bc80f00b642bec65/dolikupuzabezoxelekonape.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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10712 bytes
SHA-256: f1f2d183302660fb25c9df90ee2c7a015f99d19715dfd429b299c7dad96e00cd
font_02_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 18400 bytes
SHA-256: 393c11d50ba67d7bf52a2aab9722d9e43c0ae76bc9c6ab018df6508134295560

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