Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e965dc9665a44bf…

MALICIOUS

PDF

82.2 KB Created: 2021-07-07 15:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f857f2ed24c5181b025862c4ab3fee9f SHA-1: 3046254b81b35568475187f66d20c9fc0d081836 SHA-256: 4e965dc9665a44bfed7aed38fd49526c13f2117bc06dfbd0c89655d88ecd834e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://geredekombiservisi.com/userfiles/file/16827810622.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607394ec0bac8---34774176088.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710ab743e98---63628374542.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ki9re56rq82pnhp0bhmaahdc90/defofatovosinex.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2cdb74831f3e294a21718b48b3b936b4/zuwifetemizanatujizuvi.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1f8faa919801745a8a612f355d4be9b6/durisodiloparumetutujabux.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa57c606852---gefak.pdf
    • http://marketherballize.com/ckfinder/userfiles/files/13720152140.pdf
    • https://cahayaapi1.com/contents//files/78325361830.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b0d230c77f0fb11986c5cac7cd33fad7/balarera.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e012e98c47---zejonalose.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7je2jeb8joei3q6qn2et5h36t4/suponu.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/551922150.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/061355915c8a7e0c16eea30930885aeb/lajumozises.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54bad71030d5f98fcb9057db620c716c/wimikefojelurudufejov.pdf
    • http://promador.pl/userfiles/file/59926096175.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f41dea40---bukimobujiwudopefowepoxe.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e7492fe1---junof.pdf
    • http://aligokdemir.com/resimler/files/35239868476.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/63b1170291aed2ab0be8e65ce9f76c1c/17532650104.pdf
    • http://snap-drone.com/userfiles/file/42216210100.pdf
    • https://juraganmonyet.com/contents//files/52389947074.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b755df27---55820378419.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c47332cd---8104511966.pdf
    • https://thefertilizerequipment.com/d/files/timudakilevukudi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=trig+identities+sum+and+difference
    • 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_off0000dcef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 16792 bytes
font_01_sfnt_off0000f501.bin
46633892557d5f1306859ab334699af6f932a50ffeb0029e49713cf613cda426
pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17536 bytes
font_02_sfnt_off000122f9.bin
e89c5d9a9855281b89bac3b36aba506bfb376586069ee233597f278e652cd975
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 10716 bytes