Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba35cda274c4e1…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 06:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43c9dae873511e0f24059e35101de0c6 SHA-1: 799dd7faf8c7a67d0043fc1e09dfcb0f181ddc70 SHA-256: 9cba35cda274c4e101746e4f63b3673cb57ffa6ee49a1b10e166ffb09aa1b763
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://innotec-industrie.be/userfiles/file/sokesunumisisamazifinogu.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1afd741da---66341841839.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4a07c278b1b7a35b91b80b4bb50ab41/leveguxebogutapow.pdf
    • http://www.heksan.com.pl/file/zopemoga.pdf
    • http://soleilboo.com/images/uploads/files/68344747221.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5f05ead6---lidezemeti.pdf
    • http://forter.vn/hinhanh/file/nepekizozofoweledaremip.pdf
    • http://chalappuram.com/userfiles/file/mitenede.pdf
    • https://prawobrzeze.info/userfiles/file/woxoxiz.pdf
    • http://jar-ted.pl/file/30767714484.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43637a01cb---21671085731.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d1a6adcd---71020772947.pdf
    • http://muzeumostrowiec.pl/obrazy/file/lukaravekesexilure.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a9a43abf---nuwamuxig.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/619ce0af800433f79d252adedbbdbb47/63263599114.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e133ef7b4699900d8a34d463b5a1e0c0/luvilokaselafedofuzak.pdf
    • https://prtl.pl/userfiles/file/70270956858.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8872c681a4---puwel.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/6tl188m6age5r4utkpqpj59760/kokiseniz.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b98984dccee---gebexupifewig.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944b0d09f7e---14715236292.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00c9b307d---53640208714.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/73565c543e209cc4bc83ffb4366a2186/vozusow.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd26873d8d---lefasuguregeferiwejaro.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db351acdb22---vamanelopakenemakazan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cake+countable+or+uncountable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86b.bin
8e8aaccb5c4c4ec27ea7c3ba8b57ed7a7673d342af32fc3a8a58efcc468d418f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 17872 bytes
font_01_sfnt_off000107cc.bin
8e92f11dd18e2ff6d95f87b027ac7da52788f4d26495f8e206d180ba11be8132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 17496 bytes
font_02_sfnt_off00012225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
font_03_sfnt_off00013a3c.bin
79d6f44138efcbd42bad86384f9d40f06d3b5deb10a4a2d2d091c3d32b0ac251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 10328 bytes

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