Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ef030133639811…

MALICIOUS

PDF

143.1 KB Created: 2021-07-01 00:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f4a93916338dd32c692e0b98cabf84ad SHA-1: f7d756b1847d3af4f1663d1f2680837cabb5675a SHA-256: 65ef0301336398118eb5a5a418b2a9944c9157ebde77dc9b687253381ad54280
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 high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://akcjonariusz.com/UserFiles/file/49189290194.pdf In PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/91567659948.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pm05gmjvb8qg2j9gb2c018s8jj/jarufovuranugup.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4519d756---77397566912.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb488f905---bamanuzoredukukobor.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/43c87aae60aed1708b2c64e2770081ad/83208543778.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1ocp2nu4jqknm7pga7tvm7g24d/vuwonefolileri.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9d2d0208---96013440530.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d614294b1e---gazegugunanux.pdfIn PDF document text
    • http://bakoca.hu/files/file/nelolabukuzusum.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43d3b0511---15110428363.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/59552597899.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gosakubufaseres.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ee61ca50---rejogimuw.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e18c5527---22858877429.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/c3qobp636lsgftlfn7k6f56tv7/buxisejagewad.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/60264091363.pdfIn PDF document text
    • https://promise-land.com/upload/file/89470828193.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbb06fca0---wowubebifodepevavikokodo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jpftrvnpaenal3t0490v2h9ckf/37817672179.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/68e136dd6e97a93d2763e243b39f1e3c/vafesoxoxavodoxudamunusir.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160912fb300fe7---zagumuzemuzol.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/najogurotonuvezumogo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ec850c9bed8ea2c2688576f7ab1cea0b/43677762304.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa0c1566f3---wapubuloxevolozir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=analysis+of+the+short+happy+life+of+francis+macomberPDF 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_off0001cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E395 10980 bytes
SHA-256: 723cafddfef5d0f3fc9dfc8e1b80be16d2e8289d15e4d34b9396f1cded2550bb
font_02_sfnt_off0001fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB8 19348 bytes
SHA-256: 49f3afb308fbf161d2bc6007d00c2b92ebe9dd0163a040bd6bdc3b5b8e6a5186