Malicious PDF — malware analysis report

Static analysis result for SHA-256 83359229587d650c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 097bc10dba9c932228e72a42d16b25f3 SHA-1: bf98acd6d9241f30fdbdb651f39138391b29020d SHA-256: 83359229587d650c171ebeee46a6967eaf58a387a3fb351668302459277e08d3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cheniou.handysociality.com/upload/files/42441685507.pdf In PDF document text
    • https://99shayari.in/userfiles/files/55967753060.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161388b2883554---81872261922.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614319586c693---mezatelulopesipezagoradu.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/19780951235.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/jezefejapunenetewi.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/92095848889.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/56546268575.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wipifegabatelapogenubeji.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/21740502340.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/77312980453.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85700965327.pdfIn PDF document text
    • https://777mto.org/contents/files/lukinedujotitevudixogu.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/nisibedepaw.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/xabodofuxizolexokopurat.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f0da295928afab5aae610bcb29ccfe9f/59672093582.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/76413826227.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/52351128520.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/viripepaba.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/fizixulajoduf.pdfIn PDF document text
    • http://tzsunup.com/upload/98896798184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+phones+vs+windows+phonesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 18204 bytes
SHA-256: c05a8b2a53537007892dca532e1cd7292c1d17acadb9478472dbd9657e7d24cf
font_01_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 10316 bytes
SHA-256: e14feae5169241364e85e14959f0dd0d6e5e4a86a24c3a3db94170aa8e98e81f
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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