Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4142697ebc0acff…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 04:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f051a2164281086e180046b16a99e15f SHA-1: 164f05b3463fce9ccdc1efd658b6b012f2867c97 SHA-256: c4142697ebc0acffe62f44577522768d2a5e3b937e38ee75b84f569f3af37bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=kong+skull+island+full+movie+stream
    • https://elperrocallejero.info/ckfinder/files/nutexubanaw.pdf
    • http://melodylavernebettencourt.com/media/file/92091898834.pdf
    • http://nissanotogovap.vn/uploads/images/files/73357839134.pdf
    • http://fantalife.nl/userfiles/file/60409002870.pdf
    • https://olboihorgaszto.hu/editor_up2/70498080320.pdf
    • http://tongchangkj.com/uploadfile/file///2021091518592059.pdf
    • https://hoya.hr/UserFiles/file/limuzadebuxu.pdf
    • https://sklep-pinokio.pl/web/uploads/files/xebogopurabimuvizobugob.pdf
    • https://bem-sa.com/img/file/33380942138.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140211f4a684---vawekiw.pdf
    • http://samtekelektrik.com/files/dupowaduputiwusaponopaju.pdf
    • http://vindindex.nl/images/uploads/44176954031.pdf
    • http://tauroconsulting.pl/userfiles/file/99227778954.pdf
    • https://tezerwatch.com/file/upload/files/09-04-20-13-52-64.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/49025375466.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/kowefazabafovena.pdf
    • http://93564497.com/userfiles/56481325451.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3aec0f5b50c054215ceab5737a8831d6/setewafuterivanakasago.pdf
    • http://houselandia.ru/files/91647675327.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3e158804b822d868f560acc6dbe08a0b/86263315047.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39825534326.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ace807ab1---mexuxa.pdf
    • 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_off0000b189.bin
f0bca542b52658ee88abb664933f373fd19e6289f9c257ca32ce6d6a1eaefd5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 15540 bytes
font_01_sfnt_off0000d910.bin
17b073ef738c70354991b329e7269bbf26e623a4f674adf53d0bf565da975a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10944 bytes
font_02_sfnt_off0000f247.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 16792 bytes

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