Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f7b8efcf4a461e…

MALICIOUS

PDF

82.0 KB Created: 2021-08-25 10:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b19ed256b6f5ce928fe2be0c561ebc8d SHA-1: 13281e2cea40ba9929047c3c01a5ee9c530d072a SHA-256: b7f7b8efcf4a461ef792e7667a4151bac163461be35d0a7f8577ccb80fb071ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://shriayurvednagpur.org/public/ckfinder/userfiles/files/54055135216.pdf In PDF document text
    • https://kermanrooz.com/img/files/44815971139.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202108170224178309.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/28118407975.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/vijeza.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745cee991e6---mawewelepewarusorota.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/39a0da53bb9a232cff0c67daddcd5fc5/43930523143.pdfIn PDF document text
    • https://italvaping.com/file/78535613656.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xipojemakedadoposamuros.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/34006992827.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/78703494162.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83762b99ac---66710333937.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/gutemunopejovefewado.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079ffad7316e---88369689674.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gfacimocp32u8abvu55h1bpjjb/3910081286.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tivinekiruvof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=counterpoint+exercises+pdfPDF 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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 10640 bytes
SHA-256: 3d5787080d4c4293d1ec76fa0a935de9258588c3f1f026b5e80c3c8aaa21d902
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 17248 bytes
SHA-256: 5eb913220700987a03865eace0cff6431966f08a6d43c6931c3be7dd69db2d2b
font_02_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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