Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9cb445fbdeb16f…

MALICIOUS

PDF

98.2 KB Created: 2021-06-28 09:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 958962477894419e4957b73e9af0210f SHA-1: cf29fc9684b116ee057aba1fce78e31bc71ce888 SHA-256: 3e9cb445fbdeb16f1461f81904779058710fe76780764abaf4391acbae3d6bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://allytemp.ru/uplcv?utm_term=perspective+for+artists+rex+vicat+cole+pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/xuverexebazutivuri.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/696aq6noa9sh3sndjt8mejflsc/saliloxutowab.pdf
    • https://anfauglir.com/images/file/5372811079.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcfce1948---4245316558.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b740c7235a---waxuxefovipok.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec1c6c6d7---sirekutisuv.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8fe8bdc1---wavuxowekimugenetu.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf3c0ce02---pukawusabeludexe.pdf
    • http://zuestag.ch/userfiles/files/13550308275.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/pamiviguxokumuv.pdf
    • https://beautyyaurient.com/editor_upload/file/dilogosamiv.pdf
    • http://iburgisidimarsala.eu/userfiles/files/24709773192.pdf
    • https://evergreencans.com/userfiles/file/63189381791.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210608024510.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/47b61a6ca5e65beebd4e7a4b93cf79a8/24898451721.pdf
    • http://ackerviewguesthouse.com/userfiles/file/22865496985.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6835edcb7---bibuwodexixenilu.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/03aec5b3509b5eba956b6e8b6a451cc2/53653761429.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7df98be968faac3ec9be4cbc8491e218/jogomodutepomani.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0643bca9e5---maladebozavejamevajofagu.pdf
    • http://wooshin.kr/uploaded/file/85632182660a192ba6be08.pdf
    • https://aterhesseg.com/up_image/file/miwinir.pdf
    • http://axiomestates.com/userfiles/file/63892547941.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078855295b---daliposejojako.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_off00011afa.bin
5c31c5c3510f03dcab69150e88a6447343fbbcb19e112d5739f4e0260078bd64
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 18008 bytes
font_01_sfnt_off00014a7a.bin
45e757153fbae9d36a2b9f59ba90aa57aeaf988d7a7ff4b361cb564d8b50bdb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 10676 bytes
font_02_sfnt_off00016328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16328 16792 bytes