Malicious PDF — malware analysis report

Static analysis result for SHA-256 571fc6026ca92a66…

MALICIOUS

PDF

96.1 KB Created: 2021-08-03 12:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6dae02cb70cbb9e478118f9805f06238 SHA-1: 832d91cbdb0f6e311c7aa36cfb2a1f8ad8109bc8 SHA-256: 571fc6026ca92a6691179fcf8f04e1c96f1ccdd5b7374b56613c25f3e9dbd63a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URIs and the nature of the heuristics strongly suggest it is used in a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://elcivan.com/admin/UserFiles/file/zatusigejureb.pdf In PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zoxezefipo.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/4681069049.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3f85cf34e2ad2e454a5bcc191d32e945/87238104619.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xedata.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a44fd6fc38b3f102c4f0ab366633f594/vuwobokixajazavagaxinox.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/31804743876.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/kibolabuzosowebef.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-31/20210731024204103597.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/52024665966.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003a7adf103---4850349861.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/51626319385.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/60989170351.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jusozadenujarafilapadawoj.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f770b9c7050---70919930009.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3846a8dd5---66084506922.pdfIn PDF document text
    • https://mikludava.lt/images/files/24117056613.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/96520209087.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wirojorezepo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d102c4c---gasimavemudibego.pdfIn PDF document text
    • https://businesslife.com/content/file/12736631726.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/54414741328.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vur77q3oda76gkel366bj3ppoe/47421821930.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/xudiwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vivid+workshop+data+download+crackPDF 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_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 10692 bytes
SHA-256: 8c8ac8d26ce00d11c25ceaaf030d2bdbf16676bf4b09e5e5a66fed3ec6e65216
font_01_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 19128 bytes
SHA-256: da3248a60e6e1de88d195a94a929168dc13229506a740eace57359647412092d
font_02_sfnt_off0001596b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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