Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d0a2d03adf66f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 02:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7185c5e166da4ef5c057130c47c6529f SHA-1: e3066089413600f56259d43cc90b0da85ae1f126 SHA-256: 4d8d0a2d03adf66f6f249d007f075821e1ce2ca7084dfd89883bd96e494afb5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://people11people.com/uploads/File/gebofuvijevizixumeb.pdf In PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ruluk.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/70961305680.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/17992499634.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/44310904903.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d295e87f8---6727373673.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/zunexogukozorirakum.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/47547646950.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/13750977335.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/fugemen.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/55360879204.pdfIn PDF document text
    • http://heureka-cz.eu/files/71209804982.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f6394bdc49e90c190488c0403f17a7e7/35228400613.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/bukesogixol.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/pezajukijet.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/temazexujokexiji.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/071cd1fbf0b5eb69dd500f2c14add7d3/zotuzuberonujegapeg.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/92662204743.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/sowamonodogifivobevi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db780deb3b---fabibebejobukopamar.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/vofofipe.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/fodekoj.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/50494369646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=alla+prima+ii+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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 17872 bytes
SHA-256: d0fcdbfe70504a54266b646d1f356897629970ded5aa3c604667ca77718fb79d
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 10016 bytes
SHA-256: 4d6d6a222e37edcccbed07ae83c070fa78926c13a3c027ea7590fb077d481244

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