Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3aecc80429c999…

MALICIOUS

PDF

94.5 KB Created: 2021-07-29 16:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f650e4fb3886cf18a98796faa0f0b61c SHA-1: bb38904c36b9a5fe0a83f5f0f4c7c58461da1002 SHA-256: 7b3aecc80429c99951d2f3352292e24d9843d7b9923cf7e34c183784a96c9425
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=what+is+ethnographic+observation PDF link annotation
    • http://studioego.cz/userfiles/file/palorudife.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867c22840f2---74551770344.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/70761472958.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lq9drqgi0edb8trg8mbksusltu/23242995976.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/52927191699.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i86j5gkkiu0kbf63u6dqbbr0s7/24257249129.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/79301889427.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6517b4ffd76b01915d26ff268472e877/32026134779.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/bazokepivipix.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b491930cf65---pegimozonepebuxatosivusur.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16231034033579.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0b5e7091---22125300151.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2b1118b1---mawomeluwenugupinade.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/89d5448199abc5de7d875663aff2ec28/gabirafomupavogexudo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e90eb95af---dosunari.pdfIn PDF document text
    • https://emmaushuis.org/pages/77456096512.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/heipltli99vnunhfrscr8msd87/81036994050.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6a2e7eff---547303499.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/74697470918.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/13301914853.pdfIn PDF document text
    • https://wonkingchina.com/d/files/vixigivavolemufe.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/14872992702.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79eb03713---5420787484.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a0deaee6571dc79d026fea36a8a86102/68800927221.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_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 10804 bytes
SHA-256: e5c8cbf9a01f96fcd8b1808aac50488c04433f806915fc538915eb1975796da2
font_02_sfnt_off00013f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 16860 bytes
SHA-256: 204b7c4ae5ec9af9b5d61ec66e32712019ca28781e7554e744182193f37932a7

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