Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5cc1f3273459f4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 02:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4dcbcb9b049d288cf631ce657013e4a SHA-1: bee6ee657fde36dca2c94808c150c1f711275a1e SHA-256: 5f5cc1f3273459f42055f90605026af4767268b2ed86d941eb54cdda49304212
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous potentially compromised or disposable hosting sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.verneteco.com/ckfinder/userfiles/files/86712450537.pdf In PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/jivufodevozutujaparidim.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/gitoterusorimulazodozuw.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/86229350303.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/gisepevunoxe.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091005043696.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/996de597c9b58e2d410a5e1c622627d0/33423797675.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/30576046826.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/32731312322.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902090820.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bafowewikis.pdfIn PDF document text
    • http://fabtur.ru/upload/files/4362295980.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131706405820.pdfIn PDF document text
    • https://laser123.com/geektic/files/13397558341.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48f4b917c---83543410538.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc446fe20---23501907405.pdfIn PDF document text
    • http://soles2walk.cz/data/file/78695035351.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/nomaboritirunuvoridi.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/sotesuvofaganojomamajok.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zeferanevilaruzulopubed.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348fdfdeafe---lirajimemexekepalibed.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/zogukekatakapewakubexubus.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/pukiwutiminolit.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74911454294.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/60f18b96cf51b80a059f3b68ce0a373e/18822805124.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/87052406677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=duck+life+5PDF 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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 9904 bytes
SHA-256: 9d4c4c25c829a9976b833689193fa7923b8ecd002a88d71d567487fc57da62fa
font_02_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 19416 bytes
SHA-256: b9dc728cf89ce3ce1a764d88ccbff0c79a67291c9d0a10c06ba688f80f3aa122

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