Malicious PDF — malware analysis report

Static analysis result for SHA-256 078e614cb99ee8d6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 07:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47af804640ade398847888f965df3c87 SHA-1: 23c71c92e28e1cc6106a7cac0ba1fa521f6b7b74 SHA-256: 078e614cb99ee8d691755fbe4c0b095f345d6be9ab4eeec36bed672a840d2613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the heuristic firings indicate a strong likelihood of malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=mims+medical+microbiology+4th+edition+pdf+free+download PDF link annotation
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a099026df4970533ae2dbf0e8cf68c24/89770644964.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/jidumi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1d9153de9---71747075420.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/93183601845.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/81752642e0bebd1ada761147bd096a26/fidoveb.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3f53608c---39558018419.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/dejewefatipukotaxadoni.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/wixejetafulesajotezu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090f52a6dccf---36134910175.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2ad4b3ff58460d78f367f29d8c1401a6/wawekof.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/kutetumawovu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aba39ea0e---864913160.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/85759065447.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9so0qknmlrr1atn6jg5kv49dj7/10058782274.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/jewavijenobesenoja.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210613_7FED82F438EEBFAE.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502bf909c7---sakilafogunupupezesinami.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b7fadcd205b39c1e13415aedeaa19903/mefezovekedeli.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/giwuvab.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/radosidokakimoxevasif.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b86f8ad03---42753476038.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/55496839626.pdfIn PDF document text
    • http://slsnn.ru/content/file/39792327319.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/33919739190.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/78521754520.pdfIn PDF document text
    • 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_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 17564 bytes
SHA-256: c90c66fb0157e592b9075847ce742a3bd20878a6382cb0d5ed6b67bd8bfc764b
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 11476 bytes
SHA-256: c7ac27e514ecaf184eb6a175ad9e783069b6a791d40414edea26665884468c05

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