Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cb839b0780e4e4…

MALICIOUS

PDF

81.4 KB Created: 2021-08-29 20:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 960f8941ab22c1b985cd5d2479bcae32 SHA-1: 3d0ee6e7e8464736991b2f3379d85b2e22412ea9 SHA-256: 43cb839b0780e4e4a40367895dec107af351db74725d585dc267da80506250e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://akcjonariusz.com/UserFiles/file/85437792913.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/60366293413.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/96420217280.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/lexelenawitatubikofumixag.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/99029708059.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tororurama.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gimufot.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8eea92d6---dujufemod.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080079e3d2aa---pibixup.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/sadikebigi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ade97c9175a55c117156089e8f0a22aa/73274632739.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2l00bvv4ndp4djus4a02c0j1p7/59773834502.pdfIn PDF document text
    • https://digireg.it/upload/82709115640.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vemejasaxa.pdfIn PDF document text
    • http://mfahk.com/upload/files/dutonizeparufupu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e836accc---71584467971.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/39080533886.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a9526f3271b456b23caf18fe2113fdf7/30264712154.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a09be4d69---zezobuzegijufilu.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/5789328896.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/zibosugoderuwegiwif.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/33653353512.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/072234553779.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/romugowopanozomarixudowo.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sugixisoxul.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab8ec7c1e---17772695085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=news+of+the+world+123moviesPDF link annotation
    • 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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10824 bytes
SHA-256: 1c25988cc1153a86beef0dc961985d265156fa2346e80a0ec8ac19d0c3eae8c8
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 18100 bytes
SHA-256: a48815c70471589a9284aaf3434f5ff5da586fa9af00316eaa8c0dbcc33e5e08
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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