Malicious PDF — malware analysis report

Static analysis result for SHA-256 653a90bb8c340a98…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 21:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c8e10587081483f0732ed2e630567f9 SHA-1: 3e812341c1ee9e440d38d89eb1822c1ae9872ed0 SHA-256: 653a90bb8c340a986c9f40bd5efa5bd03d013fa4c04757097f5485cf4f8f6c9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, redirecting users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=law+of+attraction+vibration PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bnsuc4fsc523er79bn2m25l5f0/66758951463.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/robiririzusujofalo.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/litavanizomakom.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/84319779153.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/26925912532.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c80775a98---zamubul.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a942930bbb---lunevuzoxivebugizulusu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/nikufelavukivesaropagi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/73304f79ff56b32af54c1b349fc7ab5e/66242151980.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/18127570925.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/59441007758.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa9a4178d---75364875706.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d6822223a43ba1006238b42a1ac2d673/mitumoxozugijupad.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/33284469765.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/18786541448.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/vedetobasuwatatopa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c260209b24e---jisilezikafesosozolo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ce672f25fa2b79e0a3729ec952cef7cb/12494955819.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b73f2f593---galumazojomemaziwumoragiz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962233ae23a---kawoge.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/17707802069.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/vokexagexaji.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gefefanexupumilipema.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/19999431359.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/42059647512.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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 17964 bytes
SHA-256: 220f020b07ac8ca5afa3ed795b5cb28912c9737792d7176fb3793f4e869874a8
font_01_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 10232 bytes
SHA-256: 28ee1007985608111e71b6d2a5585d22ce1906262dfc6f179d7187391bdfb790
font_02_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1