Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f1968582c1da5a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 05:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d3ca08e36d407d21b69772121b27da5 SHA-1: 481e158bef1de5d704d2136b170d7478631ea38c SHA-256: c0f1968582c1da5acc943a07b65b5a01342414baf9565f5cfb370f7777a01f75
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, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=types+of+combustion+chamber+in+si+engines+pdf PDF link annotation
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/50679584005.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/92986983549.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/9604234711.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/gematomiju.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/nerebabuzikopunega.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/78742476137.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/37244cc8d352081c91044e7f9ac7455b/tazaresopuzu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720fe868bdc---79631434272.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608042c8d6cdd---gijisonigibib.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9942d7c4---17896663409.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/lofiderunujivol.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/sedexidajefodewet.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/93514876412.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/54364669733.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/52ae16fcd8bceee0307c414c0d22d9d8/79633844071.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/93004508958.pdfIn PDF document text
    • http://jump360.co/upload/files/20210726232221.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/oii45dniefnb2l4q1ci5v6cq02/gulukepewime.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/882f876f97e4a058ef95a47b0722b085/94492507385.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/61686672972.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf44a7aeb0---51428362303.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/39325357064.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b12c52a372d5add652cc343afa071f9e/risonagatekefunuvefi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bf17b25c8e20d3b614d038af1c6c52f0/vamimanutipe.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16952 bytes
SHA-256: 57a9852826e41588106cd0b282b9cec34c6b5d58c11045d60c4db5fc62de217c
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 11336 bytes
SHA-256: c9d048f753c56ecd641e715474c91e5807a573b25789b89b7e5eafb2564c4fa7

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