Malicious PDF — malware analysis report

Static analysis result for SHA-256 84235de09a1aeeb1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 20:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 346422ffec73139273e8768c090b0b25 SHA-1: 3704d31c4d58a0baf0aecf1b5e2a0bdf9fb24618 SHA-256: 84235de09a1aeeb17e962a0b6b090ab862090d77ec25481f3f2d22858fdd3220
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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/160b3216682ab1---vozeraroxulujetefijidodoz.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h0prbu7anf7d1vdkgm6c4kaeg4/gikotibefemekukoje.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/84002569566.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/14555759167.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jrhfjlfcgab6anc7kkuf6l11be/xedutalixixitagufud.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/28082242466.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a740f46eff8---sifutadulamuvijem.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1cef10188---65130160734.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/83849730569.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/155143361361373aeddd898.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/77586535551.pdfIn PDF document text
    • https://nada70.org/userfiles/file/70110975578.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a90643d272---wijefipezejuxiwizatadu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/198053d8e7d56c1664f423634e4598c2/48495192909.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/7b5582de5d3213dd10855a948283082a/megigulupidevorexabumel.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817391f2aa3---modepuwoxabuwumer.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tobanapexamuzemizaned.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ebafb9c150f12f9cc6e700d266a436ff/jokozowa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27b13dd9a---kotukovajotoxed.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c761016cb1---49777692660.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9d0ef1d2f---95559198870.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/80633026678.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f067e477571---lerer.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/22610402371.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/753cfa7b19a92294997475c4cfc04392/89088295454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=landforms+worksheets+7th+gradePDF 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_off0000d0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 10848 bytes
SHA-256: e79332eec44a573dd7566bbba097384044f5576f94c33fc93d34e3930b4cc889
font_01_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 17624 bytes
SHA-256: a35957f8c0a0d4b3c6d78f2a6959f50b0e1f0a6306a5d1881cadcad2b142a837
font_02_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1