Malicious PDF — malware analysis report

Static analysis result for SHA-256 927f835c7e67a645…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 23:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4144ad98673803e65908933f93090017 SHA-1: 81bc315c68751684238e0328447a0d0b4ff510e3 SHA-256: 927f835c7e67a645a94f3a1aebaa5bee9fd462b07d9707989c675fa90cc406a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and link farm heuristics indicates a strong intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://abugfreemind.com/userfiles/file/10824354658.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n0jl2k25qh3u8tobdpnvirudhe/fomidejufunejujudetoko.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/nimiporurafurikov.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/dimuxulomojafiwedaxep.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d6f39613---jupavezorusiselipo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/45137732377.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210619052556_1804511772.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3752a775004935f932704dd8b6fda0b9/bizemasigaverapigivulime.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/lubaduvojogarejusilatu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5295733a---napajanosokedutu.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zanizenulimi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160967c94c4b46---gufizutufalemugo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/50158a0654538ed5b8df8370afa5bdaa/kekapor.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5f061136b0f2c3255534df42227900cb/9019939995.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/44779894305.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/51224198176.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608044a83ee27---nulafubugawiboluwamume.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qr4alpi82amghkmmtc37nkaue2/34762202907.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074126395e17---61678164923.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/112331396060b01068650f1.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a05beb817d0ec357b057d7c28153ebb6/9199659714.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/muxebip.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c2394e964e0e7f97506d3a48c2a214d4/lazaputozijikefusuboja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=seeing+44+everywhere+meaningPDF 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_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10540 bytes
SHA-256: 52da55363c3302bcb4c2093a0f1adf672f275fc779bd411934dfb89ab0b58bf6
font_01_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 17644 bytes
SHA-256: 97ad15b7969a12e0f35b1c23bd7d830b10047223daf430a779fbf241e5f835e0
font_02_sfnt_off00014819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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