Malicious PDF — malware analysis report

Static analysis result for SHA-256 8323ef4488d4c8d1…

MALICIOUS

PDF

94.9 KB Created: 2021-06-27 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adfaad34943818ac86da72c96e35fcf2 SHA-1: bd003c3c8666074df428f8d2d047ebeac1c9cda7 SHA-256: 8323ef4488d4c8d1b454437060eafd170f1552f0bdfdb924cc6ddab8d1cf25a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites using the FormCraft plugin, suggesting a link farm designed to redirect users to malicious content. The presence of these compromised CMS upload links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b892e6b2cb6---82154292449.pdf
    • http://cocoal.com/uploads/file/daxejidusagu.pdf
    • http://turnyras.lt/Files/file/94497294067.pdf
    • https://ayurvedaemart.com/uploads/file/28482762443.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb35ac986---11026199156.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36ef7b09e---34314693703.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jf8sej2io5mpnjegh0uk2a8ou8/kedizipojuvevenuwakikupe.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3e82756e8fc38dc198e0ac9838b91928/99162725544.pdf
    • https://m-astar.com/UserFiles/files/bodaguk.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/50080febc86e9f0b0b98f46a011d9eda/wiwiler.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e59b09ac---madegiseluzekakivozonij.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609889a9cd59a---ziwugivuranikada.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/871fbb76ca92c7b2080fb7b628b015b8/sepuvef.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160732c18c6055---xolajarosusunelomitoxi.pdf
    • https://nezrenpin.com/calisma2/files/uploads/37982333063.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e84f583ab4d1e700d65698989f3e4859/47437770111.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1271e9aac6---nevobimurodanituzowite.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pecjcggksrsmbr9jjlcbjrupbb/33210800457.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d76effca---bofun.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/vunexumezaxi.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/q3qiq682d3fultm5tvrsoerlu6/punakajogivewiw.pdf
    • https://eyetracking.pl/userfiles/file/sesipozopoxiwuweragodigux.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/c93gmj6t41q44cdd17ji94f5b4/9647725551.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160915ef60dcde---25296857683.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=use+a+comma+to+separate+independent+clauses
    • 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_off000110c8.bin
d56b68e32c88d31c6677cd30e6ad372f7fd8484d22e98955564a2ba544df5c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10780 bytes
font_01_sfnt_off00012993.bin
4645b4e2cae5170bcea2a3959c979fe8aeeff7bfd0ec5457a7dee946e2a6b4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 17244 bytes
font_02_sfnt_off00015606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15606 16792 bytes

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