Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b9e5745199b555…

MALICIOUS

PDF

84.6 KB Created: 2021-07-24 21:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d0cb829ac73b17ef5a443b585f638029 SHA-1: 0b44e175b820fcf46375619638143c28babdebe2 SHA-256: 24b9e5745199b555d28a599ed20198baef7756d3e8b72d1df940c6c8ba0ced07
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting it's part of a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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
  • 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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ed810a97795defdebd3e0848e7a9676/rojadegefo.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1265da9a5b2b92c5b0a623ba3652347b/41279843898.pdfIn PDF document text
    • http://keacg.com/upload/files/donimalifofukuxe.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/88605571760.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa589f032---93825884424.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c183d256f2b3859bf0e5f199af3e97cf/41663559153.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45604798922.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4b5d3b4fad075a8b1a44378e1508201e/24402517021.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/77374997575.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/82492589850.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160986894672fd---85652213290.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66925cf3d6---54955439357.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e70715a8---najobumibozowusesavoje.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/71421235248.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfacdf3ffdf---jugexulamizovororegineb.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1b2e2e9ea9dc8910d470e37e9069cc71/73676006990.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dad28574---17362993462.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b5c0d8552---zurufurasalojeditesuk.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c982748a2806b9502972d11d81d36a9f/xijorebufa.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/10033715573.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/91867031550.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b79d58c8---tumelujajabaxosidopip.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc4e57ca3---87384247095.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fa8923e4---tuveriwemejuwufuvetagu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9dd583e4a1fdbda4c6d1cf3db82d8c84/mubonepabukudezud.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d99e4a84---musok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+adobe+reader+professional+7+freePDF 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 10668 bytes
SHA-256: 0f73b38074a103b1e58456b15e223310846444ee042db8577ee284bd3350886b
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 18428 bytes
SHA-256: 50b673ba4a19bc0cb5d67697ba73fe67d971cfd6cf8f76542521b129ef19f579
font_02_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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