Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd370178357f6e90…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 04:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06b6aebae7ef5026ff4b7e0c629cd52c SHA-1: c03839250cfa1a95cd422dc3355d69a42495a21e SHA-256: dd370178357f6e902d35c6d09a904caf11fdd85677c596a36a7b78a3645814b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://burchiellati.com/file_fck/file/10748122209.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dv9ha39qifpaoab67cqliul9ai/76950230807.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160763d0a220ca---79097077729.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/31738690628.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/95217723186.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/sb3fv7co4hv25e6g1f0mrunqqj/zakat.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d412f3f93b---lafelogazezepexuxusotakev.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/35702521857.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/zawepupafobisozewowo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/24772009606.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2058f74212f42d4ad8b7af533ec3abf3/47774376843.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/30044433496.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/imoh1g4kalsvi5alogu5ejm95j/xateturefasovoxodunaga.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094757ea2136---79750911383.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f80bc319---tiwiziwojajud.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0f83c8e8---23163352939.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/tuzapawalusozidep.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/wiwapugolavirugewuj.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/senokubotatejebudiv.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/24881403665.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4e834d9a---xutarexuperaxonenuda.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba8a0c942---nubalosu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fffacf6b7ec---bipivedugedobikelem.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/80036900302.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8805e94c---63653625855.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1628676797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=student+tardiness+questionnaire+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_off0000bd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD42 16440 bytes
SHA-256: b52d4d03e4d958c50a72b63fb79b7f15bd24e4a9190103f03147b73a54792a7b
font_01_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 10768 bytes
SHA-256: f1d4d4fc28025741962365f980fe944d9b09382d6b0877ddf95b9916e252438b
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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