Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd41d10f9d103f12…

MALICIOUS

PDF

87.3 KB Created: 2021-08-13 21:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1265fba511114a09534b8ba92355c710 SHA-1: 0db91d7245cee45c9f828b380bea5478b3bf9a41 SHA-256: cd41d10f9d103f127fbe16bf6163897aab3912f90edc25c36fe8e75cd47e1b9f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, indicated by the high number of distinct hosts and the use of UTM parameters for tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://itineraire-consulting.com/ckfinder/userfiles/files/4322236749.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6728cc1e---23245855243.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/73186292334.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/58664481645.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73032fb48---51770052945.pdfIn PDF document text
    • http://russia-ex.com/doxisarefipetabe.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/vunepimegadumofadonajap.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c168c7b50---60520471658.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/kewixuvotavekotiwukupodiw.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/rujonukilegexalofo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/21462745121.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705398aff4d---97193341507.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sarijafodeginasixugu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/44386276383.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/ritomekarapimukasate.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135aa19540---segobebodakujanuweran.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/450498cfc67ce9929e32592d76aadb42/98772622349.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vukuvupikefan.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/libiruzebokudaliva.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/83321164196.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8cc440c5---dijatikizopevopexufomawi.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/82397050429.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b58764bdd4134f7d7c7b284399a357da/54605543495.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d805c0b43c---56819207448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+lectura+para+ni%C3%B1os+onlinePDF 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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 18608 bytes
SHA-256: 9b87754a332d656ca9c117ff75a224cdee6fa710bfa5c13b066fc420d24ac7a8
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10928 bytes
SHA-256: 4fe2ae771b4add69833bdeab7f93d88bcaf02eafbdd84e379651a86c3b58a8d9
font_02_sfnt_off000134b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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