Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec093560bbca189…

MALICIOUS

PDF

131.2 KB Created: 2021-07-04 23:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bb32e0b97a05f460f207389eb40feb12 SHA-1: ef39c49a49cc6814c8bc6d5b095c05eeaa9a632b SHA-256: 2ec093560bbca189703af4d2c3235a2e542df0cfdc6d7e6474b4b00ba3fa4214
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS upload directories. Multiple URLs point to potentially malicious PDF files, suggesting an attempt to lure users to external sites. The document body is unreadable, but the heuristics strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c862fd12---61678079190.pdf In PDF document text
    • http://zwickerfoto.hu/_user/file/dinisivasodadig.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a2b0149e62ef9cbdf8c3374828b973e/60760238822.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/32010136288.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b30003b3d532c4b5903a0dcb94d66a91/27194083047.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/11541151149.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3e58a3d6---56717520183.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wusimiwulimosixatu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c38d464b48---26497217488.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a1440b2941ddae6574306a11c8c6745f/40544648708.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502225334664853.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2777d84f04---zagaxejajafixefakudem.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2594d0ac9---manumabakovisogivodanowe.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e19712e14d708a9d3b1eb0294c7db9ca/bekatijasokati.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nodujomelizililefefawe.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/waved.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r7bv4uieo136cp48b6vn8vfnit/mofusipuxamorusumubefap.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/33751881993.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8187789029.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1a517988---kabemiw.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedc5a7c13---nedakekudamuxad.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607692980467a---84600413992.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dizetunanad.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/veludelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=roman+numbers+from+100+to+1000PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A1D 23180 bytes
SHA-256: 1f30a728c4cafdbf19a9ac8acd78cc09142075a27a4714e6c7fba8707654ae55
font_01_sfnt_off0001b699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEB0 10696 bytes
SHA-256: ba2091fc8ada8629293eb11a44e458ccc88650432fa12cff1fd73d0fd2088418
font_03_sfnt_off0001e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E753 16636 bytes
SHA-256: 93b23871dd448b78503d8df101173295a7a08e2fcc7a74d3881d5505a730d141

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