Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48582c7d3788ee7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 00:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 54703d2cfc015c803b00e86b2ef3da1f SHA-1: 632b0d40322c15a8084d0b059431cf57ac5ba3d3 SHA-256: e48582c7d3788ee720f285517cd26d8dd053ebf8095c77132d7d7c96e4969fb8
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/u792a9eogbthttni8cteka1o35/998855309.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/09cf7ad56a1b65f556abafec6469c854/pusimugoma.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd75422c30---11132345285.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb0985348---1297318656.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094861463665---bejiwijopebikatolo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40560eff89---47436314952.pdfIn PDF document text
    • https://oversaslogistica.it/file/76019684994.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d5oompg1tmqrpcum47m4778b24/weralej.pdfIn PDF document text
    • http://ubest.ru/images/file/nininebaxatomaw.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ffdc4029e---vakolubazitufub.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea6f4ac80---jutil.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7d1c43c4f457adabd7bdbdcce649ab3c/kitojomonoruw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f5fa9110---69451225412.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/9475975509.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/862befc3240ae850874dc266849ed18f/sofesanokijigefimo.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/bagusatasinokanaj.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b20223a5---95738838659.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f1b7adfa---25185385412.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/71be493acfed74e3ec4ac2354b92bfd0/73707269269.pdfIn PDF document text
    • https://sealskinz.ru/files/file/widiberebuk.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092861171a41---gamijifuriwoxitok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=world+birth+rate+by+countryPDF 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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 17104 bytes
SHA-256: 985d892eb1c456bfb40ac2d03f61e96dacc7f7985906054b2be920d58042b767
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 10644 bytes
SHA-256: de8d64242205e19096e4d7ac088dea5c94cc7dfeca7ebb0ed323c028312492c5
font_02_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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