Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7783e867297e3c5…

MALICIOUS

PDF

88.2 KB Created: 2021-07-14 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bc12bac45cbcf7e77846e640456371b9 SHA-1: 3fa6045dd1d94cca8cf34d38d18257a2b746a0e5 SHA-256: b7783e867297e3c53380a9e2a07af29d7174491a582a668bd869ac36de2e5da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=swiss+cheese+ventral+hernia PDF link annotation
    • http://cw-cut.com/uploads/file/27326750811.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6ceb9741---77058206996.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba32964ef4---dizerepovevepawogabaxe.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/badesab.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/7fts3o32avi7nd7lv7cr4ugqr3/82622007157.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/47026189812.pdfIn PDF document text
    • http://amandamaitland.com/images/file/bopewibazakugamulegibogez.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/59138898215.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e62bf1107ce---fexuwojaxuvilonumibujir.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ccd56e3---rovisaneromajogemiwij.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcecf8fc81---latanemes.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/wojemaveposemazupebamusem.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c67226e9196d31fd8eefc58079a7f514/42709156313.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/99084403621.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c8c0a710---1693109559.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/35fc2d6d27079f5db5966c424e1e44aa/44442127500.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/25614637349.pdfIn PDF document text
    • http://cloverdiamond.com/file/42772130976.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a437dc74ab---77951791344.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be559874eed---6386138213.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e80ad42e---59536349480.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/98214390974.pdfIn PDF document text
    • http://www.grifin.sk/files/nunafusonoxavozud.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5635b127367dc1e485081578e2d8460a/mamutemenegoguja.pdfIn PDF document text
    • http://chapelguild.com/images/usr/bekapedep.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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16448 bytes
SHA-256: 8a1011bd22ced42080f140a33699209bf496079005cd083e3936e6ecf68f7f31
font_01_sfnt_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 10432 bytes
SHA-256: cc486a2d63fbf244eb8e0c48bc3832aa50f1f3c70c60be62c90bc60b4f11e18e
font_02_sfnt_off00013b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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