Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c51e559515984d…

MALICIOUS

PDF

102.0 KB Created: 2021-05-28 14:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eb47f2c468406f5874fcb4314961f812 SHA-1: ba216ccf636431653c23fc10077875647ceb98ff SHA-256: 36c51e559515984d11eb1d7fabe09dfb00924181030ceac6b246c65a2df7c03d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad60297fc---49025794195.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609150c85d628---nigudijojagos.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/85138589638.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1dc71d56f---23163875189.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/xapewo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pcpkq68c0immvb1deaujlrcr02/sasawudula.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8226ea0b8---78000046644.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabe12cccc---86564967766.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d058356dac---gegudagesadukav.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/50468f6516efd1f83d505436f3136a76/68257496061.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4910160ac2afc6d1ae5bb2e20910c322/71294797384.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9043qr0dr6abueg4orj3mmfm8j/busefolavok.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0170bf9f---73934339348.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/78371807cbc594c7bdfff23904598fd4/24700417671.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4599ba0f---47731043947.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1e71666919863bdabcd4b1a9c297bd64/30996139418.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a8bce966---welalofitesogoni.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=exercices+compl%25C3%25A9ments+circonstanciels+4ePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/befea49834635809624d18f5a96829b6/ripokutasutiwe.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EE 1684 bytes
SHA-256: 51fdace8bd53b7d2e6af2c0ab3a57c298b99a0f760d42a36c32010743562cd6d
font_01_sfnt_off00014052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14052 5124 bytes
SHA-256: 45a93e60d3e9df7e96ac4ab89a23f748290fd86d8eb33f542a76c747371a13ec
font_02_sfnt_off00015159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15159 12888 bytes
SHA-256: ef8700d9713c0adf4c2b1d14a19664a713bca382b744ab9e204659434cfc770f
font_03_sfnt_off00017989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17989 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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