Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a82606c0f578f3…

MALICIOUS

PDF

68.1 KB Created: 2021-07-25 16:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a59470954ba0618c05fce9a50d7c8ead SHA-1: c466b0c57559c0c1d9d2c0e496e179ede0dbadeb SHA-256: 35a82606c0f578f395d49c2a2d20c9a885a764c043e381679d877292c54539dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8474

Heuristics 5

  • 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
  • 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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ems2lfff5ikcfemeaasisk7a23/74336078265.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48cde86db0---41193668368.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da81231b7c---37094333740.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/wavodezedezafemuk.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/kemelirudoku.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/jazigifipegev.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d21139b5---26096622758.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vfa9jdbi30i0buo4h317r5tt1a/metigim.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941746465f5---xewigobusutazile.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lstqarrk63ll9oebeaf15c100p/vibaxi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8520ea7a371a8bf454cefb2cc2cdaeb2/rexovekegi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lagl470h33mvmmspj5fduvcn9q/43059103018.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5bf9ef7c591e8235c58cb9f2cf990aa7/72443850138.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/voguzawulijazonoli.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c576a68a227---mekofubopaxaze.pdfIn PDF document text
    • http://mp-journal.com/media/file/11851705240.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2ca573c2ce9a5fb3016d823c9c36defc/zewunosi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/60713206068.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb7009a68---93933595910.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070f88b04b2d---pelivesi.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/dizowikev.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d48e256d58b---66692424812.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///56988112996.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/77769126710.pdfIn PDF document text
    • https://masukpt2.com/contents//files/pifulukarajez.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609288f1c45fd---19028323811.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/tituluxovulafunavere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=whole+foods+turkey+meatloaf+cooking+instructionsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1