Malicious PDF — malware analysis report

Static analysis result for SHA-256 82afb46b990a7795…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 23:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8a2d4fbcc3de909a4b3b70051eab461 SHA-1: 30a3025a7bda67b65b043964b2fa8b8d481d3391 SHA-256: 82afb46b990a7795cf892bd38c2af04564816510cadca73e805ff6516f6abc92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=partitive+proportion+word+problems+worksheet+pdf PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327a21eb21---bofujegexaxukuxon.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb853b2a10---78101266796.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/24970857329.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0591d1e3c---tovilorulejem.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/xugavukav.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/kuwimi.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/84665864751.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ef6022bc2092ff7fe68584d0195c11e1/67336964945.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0o83dsak5h7stfhh3fp7ofbatn/kadapopofifuxevixe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a4e9a10c---redinajaterefop.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210712_EF2FC49D39075BF8.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905073816952.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///xezojefafu.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/65200187651.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/1424484467.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vulajipifug.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/wiwatuwagiruzebufotedeta.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/54838190058.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161120d6f17ddc---tefek.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6d643fda---wisalimisu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a669a2ece1f---40691236074.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/tagufegivegosukesevik.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd85107121---bikajuwunenavafazuzaloko.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beba883aaa---26769224443.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/eae736f001cb9d2bf4a683681ad46c81/rodagepal.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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 11148 bytes
SHA-256: 54cbd2c4358bf6bfbc3a927db198466517e200ebdb919155e158b63d55be313e
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 17952 bytes
SHA-256: eb8e4b0c7a99b96ad27c0e292ee4f13d47ab1007011a58703bc68955aa6bd4b8

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