Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd732daef4726a61…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 01:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acf5f36cdcd70335bb46d68db9f2e7fa SHA-1: 2b022b2e15c574d59bd721b1087ef102be3b8eff SHA-256: cd732daef4726a61372f7de7ffd0b4ed6e5036d3647d96a2756eb4037840d45b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c5d397e3---43335329729.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/1857856617.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c691faed866---43303525851.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/24091759152.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/58ba8069e1f741455ef52c95daaf6b16/boxofavezimizifa.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/be51f8ca0129e5152e74e2968e63408b/venitutiroturudot.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/83319654334.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/dabbaa2a9fb4c6b267f0db1fb1760777/34667344883.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/zetawuvemelejegusatove.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2aad48904---vuziveboseno.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/92734570862.pdfIn PDF document text
    • https://yodobashi-church.com/11581842335.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/31689668058.pdfIn PDF document text
    • http://proxima-design.cz/files/file/30681706505.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/nemepimugaxijegorerul.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/8583517395.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c196679cc99---wesonupujisedi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/96038568440.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/nelex.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/31725382004.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/90500965694.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2c44e866---19812244562.pdfIn PDF document text
    • http://ibb-online.ru/f/file/22626695407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=radiation+induced+pericarditisPDF 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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10604 bytes
SHA-256: 5e6ae4ad5d6dffcdcdef807d7aa1e685e4e2208b95d26a390aed259b85cd0741
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16600 bytes
SHA-256: 474fde1de8bb71649643c01d3cfd5e684857802e826c03f3dc68bcf0d2ef5641

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