Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13a153dd8bd04b5…

MALICIOUS

PDF

81.3 KB Created: 2021-08-17 13:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 092424e39f2d5d58dfaa766f743f923d SHA-1: 23c2f10aa889fb5c2c0ce0dbc9d5fa2a0f101946 SHA-256: c13a153dd8bd04b51088d8ee1b04a35959351079efd4a8233e8d2b8016c4e65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://industriameccanica.it/file/16012849823.pdf
    • http://arisutour.com/ckupload/files/8483816866.pdf
    • https://stef-nancy.fr/upload/document/64527243369.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d0c8caf3---27717405215.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1b405173---99137114496.pdf
    • http://marthomaiticherukole.com/userfiles/file/50995214747.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/464029682.pdf
    • http://protok.pro/upload/files/71878264406.pdf
    • https://ebooksweb.net/files/file/nelagowuzidamisizotuvun.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbc6f0c0c---dederawi.pdf
    • http://wooshin.kr/uploaded/file/171984445660f10f1bd7372.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df445424b---20606371488.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901cb2d8b5e---84706580649.pdf
    • https://somos.co/dleyes/admin/fotos/file/fopenuboke.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d958fc67513---zulufobivuvadavoj.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/dugugapunefitogefasa.pdf
    • http://mmbc.cz/_data/user_files/file/vanukanivemomaweme.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce8e4c49---geberali.pdf
    • http://ezibra.pl/upload//file/gamoxurapapupalixoxede.pdf
    • https://peterdegendt.be/file/bagopamipukisadifegozeves.pdf
    • http://presssimayeshahr.ir/pic/file/20208690105.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+microban+24+hour+spray
    • 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_off0000d747.bin
5893a436018b8e33414949af1130a076988a3c7ab7cdfbb34993f6d81fa7567e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 17572 bytes
font_01_sfnt_off00010572.bin
356727bfcd0ea5873ca6266d4bccc4a6032de70088b4e0ac955e23445d3fff4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 11220 bytes
font_02_sfnt_off00011f7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes

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