Malicious PDF — malware analysis report

Static analysis result for SHA-256 2209477616b0b854…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 09:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 752ba17b1af0d50bbb5c1a87b0ab062f SHA-1: 90dc60e3f104bf13938b6de7990d63c89c0a78a1 SHA-256: 2209477616b0b854a9bc2a6780d87395676ed3437f0adc4f49f5773414914942
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6dc5882e---kurefaxuruxe.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jelki3mub1da5kdh24n63t7d6r/35759814424.pdf
    • http://afgventuregroup.com/cfiles/file/38487543990.pdf
    • http://dioceseofniranam.org/userfiles/file/59011455105.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f9293dc9f282154b446b1dcdae8a464a/tigupematefazuwomi.pdf
    • http://zulassung4you.de/bilder/file/rusanir.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t2lmbmcgqv95vdlmed3ld5m6d8/gixekifamotaku.pdf
    • http://dvarenda.ru/upload/file/32496863518.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5c287046---45941000408.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4vt181v74nsmhs0mm8ka5s5hhc/15629717502.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac107094eb0---libipapanepilupadup.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/oi0ijhcac3208eqdpu9utv7824/93508718062.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c7a93be0---47136543485.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i7th7varbvuog45drfguspapnr/37123366844.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/015dc79084605343647e48d69587d1d5/kafezipevilazub.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7qppplocrbh7bug6hpmv95md4n/85684077346.pdf
    • http://www.pranabkumar.com/fckimages/file/72087812036.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mieg8dvu7j35fd1cpi3t0fdjju/nuzimomanodisuso.pdf
    • http://svsteinfurth.de/radsportfiles/file/92626248996.pdf
    • http://beiwendq.com/userfiles/file/jikizajizi.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8e2493a394c4ca970e24701c2eced6f0/gaxofebikivorurupumerawo.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/95a81d3ab7b64ac434b1e5cfae8033be/55122966155.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bdgo7ae0d0h2g5dogm810acg9c/taxemofo.pdf
    • http://neodentpetrosino.it/userfiles/files/didexemibizibenukoxuvudo.pdf
    • https://tavcam.com/upload/ckfinder/files/kamakebitudizuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+sherman+act
    • 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_off00010259.bin
cac62c02b292cbe31d0e384400ac7ba3cfb639ee527415b77db03fb1f8a9e0b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 17144 bytes
font_01_sfnt_off00012f12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F12 16792 bytes
font_02_sfnt_off00014729.bin
f8b5bc0dc2e396e2dc6d50c5b1205bfa3145a22c6603f115292e38db29c31c87
pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 10320 bytes