Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46c83c6b2b28e98…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 00:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39b383cd68f7426d1d3281c1045ca0e6 SHA-1: b5fcbbc8de7d66f3110b1354fef1e30aceb0f30d SHA-256: a46c83c6b2b28e987c81a86e1726952cbe13442a795418d089f4f37bfdb15cd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable domains, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=business+communication+process+and+product+9th+edition+pdf+free+download PDF link annotation
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/zuvopolodumunoludomo.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wiresalewupolitilarilu.pdfIn PDF document text
    • http://gojjang.com/uploads/files/88098889714.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20837842976.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/64f340492da9024b5b11e8bcc2ab9099/zuvemexepatukofozotogu.pdfIn PDF document text
    • https://limmaginebistrot.com/file/34061640718.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071453a9a6c6---29656195638.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pojenosiwafevubadegom.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/ratatewujowisa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49591bd84b---29617262324.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/37531638508.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/nojigobidezetezoni.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160812bb4653b3---9799378691.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/57510568320.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zezebolaru.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c0d4e15d49332c2d73a25db8816075b7/voduxutuxewigogivaxikulu.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/91446376348.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/114cbd4a9c128b0b58ef2afb941b318a/korupok.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/zajomapilekirip.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xurukevojobemobisigot.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50eea4621---2717618122.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/zanuzabapuxarub.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/giziwofopitavofimunaj.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_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 11292 bytes
SHA-256: 332bcbacff022dbabdcb0b3a44b8001fbfbc2f447779c5deaf973294f2d005f2
font_01_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 16016 bytes
SHA-256: 3dccf191280f82cd8712dcea247355b7bbed11f87fdb29a8530924f8a0d3cbf5
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.