Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b359b397553d8ce…

MALICIOUS

PDF

98.8 KB Created: 2021-06-15 15:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8275b48f833450bd10939e72d586c917 SHA-1: 026496c5e8c6cd8803a1fdbcd88047e32ce5c641 SHA-256: 4b359b397553d8ceaffb462cd17ec96de4dde0b305697468bc938a19f94cfacd
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The document body, though heavily obfuscated, appears to be a lure related to 'clinical practice guideline for the management of borderline personality disorder'. The presence of multiple malicious links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=clinical+practice+guideline+for+the+management+of+borderline+personality+disorder PDF link annotation
    • https://avenue102.com/uploads/file/84322848405.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/uahh3ve3p9977n7jl6o94qli2h/21129330898.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4c15f80847fba0603b1961b45dee50c2/zilorez.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96434b7c6---86969176457.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee37b0b0e---rebene.pdfIn PDF document text
    • https://capecoralliving.com/media/file/47025457894.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/pofubiz.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/69rmu78kdg3hjb4ir44jkf4kf2/90195911986.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9e1740de---vanewilujasubuxotiwup.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1230698526608ae7f4d1f8d.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zofabivoz.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/zepekozokokezo.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/xomifu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25aab9fe3---gunulesovibin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FD 5716 bytes
SHA-256: 21e00a2fcc386663bd64d31180299ebd13b27eab0d5af3144c21b7a121e7200c
font_01_sfnt_off00015740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15740 11296 bytes
SHA-256: 12fe413e19ea63093ddc608ec7a3cb19c23f6a7a49b9d4f3e4b407f4caca503e

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