Malicious PDF — malware analysis report

Static analysis result for SHA-256 f493b296f5e2f808…

MALICIOUS

PDF

176.9 KB Created: 2021-09-02 17:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3da19dd516eb59562490ac9b6fa3ef04 SHA-1: 2357140c0bc3aa44a29beeeb8d327bf5e076f2d8 SHA-256: f493b296f5e2f808a4f39a5ab03e881513c0ee693635e9320dbe97671f3eb34f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to leverage compromised CMS uploads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to malicious sites or for SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5359a986a4928e26b7ce80f3c6af3f87/folataponako.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fedc1cadf---xuganananopelifobep.pdfIn PDF document text
    • https://polandpools.com/contents//files/64543337512.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5632117855---14606869698.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/90872872527.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607228168155a---titamepufid.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jeriwujasixijale.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/015403326cea2c42619a2cad88295027/29994442218.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7d7d79a643f9e0a119ed5738db6a0439/teragozanikanegur.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8464c1d9a8---40125265266.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/sugomareka.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea5d0af1c1540f0302365e47e9c20ad0/radoguw.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210725051409_1166950405.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2b2b10d36111cb523b8a4ace0061060c/85105258944.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a353c2edf953ece7b25bffc7494b51d0/22645879924.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5a65abfffa1f2b0ca0ab568109468434/fawosurupibata.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098acf5cd530---vedolemenenemikusetame.pdfIn PDF document text
    • http://apcmagon.com/userfiles/duwarumizubu.pdfIn PDF document text
    • https://arerp.kr/data/file///76031076034.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984a65f1e47---voxora.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160746b0c96bfc---76305536724.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cb64d61a---gogefojilimiwewemara.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/0828a7b0318d21308f364db57cad9de8/pemuroni.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jto2ha1svo7eq3bc0t247cdvp1/68322494688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=phonetic+and+phonology+peter+roach+pdfPDF 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_off000249db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249DB 22068 bytes
SHA-256: 5f0f68c751d96f436a3ee3e8fe5195165f75beaaeb2e59afd55ad6f0fb78bcc4
font_01_sfnt_off000283a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x283A8 10848 bytes
SHA-256: 85c7aa91ba41ffcf44f1fb2e09539943ba5929823e5482a65329d5644de136e8
font_02_sfnt_off00029c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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