Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76b762ac77c977c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 19:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f9f33005def99b79eb09654099f5783 SHA-1: 8a2a9202635b0d564cb3c34378b3660f027584cc SHA-256: a76b762ac77c977c1cb7715f8bb9b8dce0b9e98cc8b0f2f445512d7d646d5cc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=how+to+silence+group+texts+on+android PDF link annotation
    • http://weiken-rc.com/upload/files/86320002436.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/52dd0857ef79e9d22688e7fc8004eef6/47965027391.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/55086171782.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/sulezil.pdfIn PDF document text
    • http://orthodoxnews.us/file/bedepaduwone.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/kebupuw.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910101304.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/55037377728.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133565faed5a---4565842062.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_96DD14DAF7E3BE84.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/morabekufotuvuruti.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/60988015296.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20019460782.pdfIn PDF document text
    • https://pokereshop.cz/data/file/42029019816.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/45405939345.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/vigodajidukimagujitezamem.pdfIn PDF document text
    • http://cga82.com/admin/File/71127246825.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/biruwuzusukakogujinemidik.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/35386795353.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/buwokugesizizetedinafapim.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/59478308659.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/mogogaseje.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6253827b---jekaxuxemosekunegekotuso.pdfIn PDF document text
    • 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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 18416 bytes
SHA-256: 945edd5861716692592b1d7133986840497eecdb8f264c107a92d8a8388db9d7
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 10968 bytes
SHA-256: 5e9a2311e09631e5ac960ef02e167d8b17cb9755f1ae180d29eb623aa21106c4

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