Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee17cba5712dfa85…

MALICIOUS

PDF

87.8 KB Created: 2021-07-07 04:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71021564f1cfa704a35bbbee57964e8a SHA-1: 6d0f92357de9a47560c4c7056faca66cc00e3df6 SHA-256: ee17cba5712dfa85ec52a2d218258271d7c1c3eb96ae481ec1de2f38a4506929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://chinajnbt.com/images/upload/File/25478397499.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/po17p17a39mi94l8mdfrnqogfd/dupev.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a169f37bcb---damuxurirup.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa7900bdd4---42521230961.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/afdf4b9bfdafb291c0c5ccdea0533da0/54149199935.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de72b0f16---zogiv.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609402b2efc0a---55593364868.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b070f742b3e---dopezotutafotixijozuwixu.pdf
    • https://aimara-bg.com/userfiles/file/peragikomopojabejos.pdf
    • https://sealskinz.ru/files/file/tajoguketeradaludur.pdf
    • http://mya1fc.com/files/ckuploads/files/xedupezemafavag.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd64870005---65177620181.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/lazikanomojewule.pdf
    • http://www.gabrielamaciel.net/images/content/file/35294174896.pdf
    • http://sushi-belovo.ru/files/jasujir.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f044c5ab---nitonovebevixopive.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087855f274e7---30807171529.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/51cdba48413044cb9a84dbbc27d2d0c7/25918754355.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b842b60e---3401043888.pdf
    • http://4grd.com/cmsimages/file/83494788796.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58288a124c---pixatisosarolukun.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b0a883237eea356e3fa683ef4e89a0a9/jozemo.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/degupir.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/m3esovp7nn55lanq76ftqt87k1/40177455890.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ct7osp0oabq6prr6sjvt52899d/27217292539.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/navede.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+does+an+herbivore+eat
    • 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_off0000f2b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 16792 bytes
font_01_sfnt_off00010aca.bin
abcdc561b2731197f812daa18f3f36f46fa8581fd7df45b79c1f09888792431e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 18140 bytes
font_02_sfnt_off00013a0b.bin
0c212352ad8ee740902ce83c9ddda28513203ddda4fe84ad50a2423a9d11e7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 10496 bytes