Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0876b8fcabd633b…

MALICIOUS

PDF

86.3 KB Created: 2021-08-24 23:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ef5f44c157c002b88ccb28834450b4e SHA-1: 9ea33b88baca2af9377902c86e011a55e528688a SHA-256: f0876b8fcabd633bbee3f800d6f07038f98538d2dce086647845f4bede39064d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://archism.ru/uplcv?utm_term=itil+questions+and+answers+pdf PDF link annotation
    • https://congchung7.vn/upload/file/63767650719.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087165b91885---rixokaxuvenidanik.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/80987010394.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/tivenumipogibizi.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nadererif.pdfIn PDF document text
    • https://fallsplat.se/file/42351816146.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/jolazuxowulexemedemedip.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/didarunekozusezegabawa.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79b22e37c---wipaxifif.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/73448598200.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/11c11c4919ffb12a55b1766e3e820c74/sewituxusoro.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/kuwexivatosifimutiwino.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119f11f1c5ce---zixem.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210626040112.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pubakenofekowoxe.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/007b6e1438fcbf407ccab5da8c1fb856/buzibavudopukuxexowunaxu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/ruviwixad.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78eaf1149b---jonuxijorogajamigamu.pdfIn PDF document text
    • https://trieurodata.ro/images/file/tagorijasegaju.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/84943004402.pdfIn PDF document text
    • http://amdind.com/userfiles/file/gadixazozepagudijufedu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119256b794---gudapagusowewawij.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rulevagudi.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/dumavuguko.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608343ffab5c6---80298951739.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/gefawozasazal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 10776 bytes
SHA-256: 96148bb07b69ff114d2d057628e5b7e47adad03d5b81d56e3082eabbcd4a506b
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 16576 bytes
SHA-256: dcd00b31793f548eb8c571614cc56f5291c2f6b33dfcf178f65ef83907f78a50
font_02_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 17408 bytes
SHA-256: 10e91183ccdaebe37008950321319256e8cf8adf863a65321cd5b85dcb6a89a5
font_03_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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