Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97683a784c1bf62…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 05:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af8e3452dd581d41b3b234c8a3710bf8 SHA-1: e19c2e8a7d28e1a84938b3dc6c71e7d8efcdb863 SHA-256: c97683a784c1bf62e4a2462bbcde56f434674ea9f9b72aa25a8b4320706b2c68
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to distribute traffic, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://olivierdaulte.com/ckfinder/userfiles/files/5110364799.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086efab05f75---18639660347.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/vipexopejemawuvosobubiju.pdfIn PDF document text
    • http://emannsltd.com/userfiles/18697963770.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c9644b7f0855bc128375a49d9b5e54a6/bonetemi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3c082e81b---nelijobazapiv.pdfIn PDF document text
    • http://aven.su/userfiles/file/gerogidovodelutaji.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/dasezujosaxufoduputusix.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/puwukisibuzor.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d6352ef0328da853768d112d86648a51/79804226823.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/45156324559.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/47jgrra2795c3om0fsku03cmao/tupali.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/gidulalulikire.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/tuxosezenapilufutopa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c53407e7d4f---3752445323.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/daneaihnnc7mdncljfo1j14f3n/togepabe.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f15d49e3d---39554636506.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/41765867992.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433105b539---zonizavesuzefisubifokaz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843b78b3b7---kimaponomudusobix.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/79634246335.pdfIn PDF document text
    • http://yongqingtech.com/d/files/46172450496.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3m54kb60rmgmenp18qoti49171/temebozefudujomofavu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d067031fd56---wowibogexoredunodibogo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/81a42118b29b896af4313e0849c51d47/62733756422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+looney+tunes+show+full+free+episodesPDF 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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 18960 bytes
SHA-256: 86a35e0cc0db755300b423607bca9e268433249cad51cdcff780046b0a1b7eb3
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 10696 bytes
SHA-256: abd5ffb3b13d4b15252715fc13421023d575f095277d13ee47dbc96d611878bc

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