Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ae1a1c099ff178…

MALICIOUS

PDF

76.5 KB Created: 2021-06-12 12:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50e12cefea75ec5a36990d12b74b3d5e SHA-1: b89fb42edc411456d0aafc6099724ec92a2b9e6b SHA-256: 22ae1a1c099ff1784215a9a86d49e443052f04a0de30edc7b49e35fe4b2cb3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The embedded URLs and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=to+kill+a+mockingbird+free+ebook
    • http://bahtiyardishekimi.com/fckfiles/file/43550415193.pdf
    • http://candientuvibra.com/images/file/tevox.pdf
    • http://absolutelyneon.com/userfiles/file/16438294761.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e3227e7d12539ffe7e2f1c97175bf445/garewozadokoxonuwiduboza.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ec4e5c7f---13902545895.pdf
    • http://goraku-sangyo.com/userfiles/file/funivimadarimevajefugi.pdf
    • http://alliusie.com/userfiles/file/37263370625.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a573f530028---xizotado.pdf
    • http://www.monts.sk/upload_images/file/mawivibiniwutebaxewavo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085169270f42---wixasibazisivuxi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3f0ba4f9---4946539386.pdf
    • http://pensjonatagat.pl/userfiles/file/gavuziteza.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/63760ebdc7bab451608830125b5b298b/dulafam.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a364b6d7ed0---12097152793.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608de21695215---60372417659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee10.bin
8803e46737d1b01d4b63217677499b2e0c0c05001be2905a04ae7faa16923c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 5316 bytes
font_01_sfnt_off0001000a.bin
f92add854f1d601f1caf3499819bc1d5869ef5ebb213ca1b90f1f32bbb6a4f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 11092 bytes

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