Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdbf16ec4ea3703…

MALICIOUS

PDF

89.9 KB Created: 2021-08-11 07:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b34b160af188ccf9a58420f22c6de248 SHA-1: b73f11adaf90414232edd9b8620a7b47137fa0e1 SHA-256: cfdbf16ec4ea3703b78cf8b4371e326c7c2f2ff0c0b86014a9c4e503b56012b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://medvor.ru/uplcv?utm_term=download+whatsapp+fixer+for+blackberry+10', indicates a lure to download a fake application, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=download+whatsapp+fixer+for+blackberry+10 PDF link annotation
    • http://teplospectr.ru/images/files/69132840748.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/nesewotinufaweloxeruje.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f7f60d4e37de162962121e88cdf6e04e/10228500758.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aecc3140d8eb28fd3f89c798483a6957/zekiboginusem.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/7453123221.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607416a32ea5a---teduvanope.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b86bb814208be456cad388383d5d3e5d/41887717614.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/bebiza.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/mavafubexuvubirixubiza.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/zikuzobiwosupero.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4mvho3adormhefjdse559f6be5/12268855519.pdfIn PDF document text
    • https://highrise.pl/file/57759971304.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/78323027565.pdfIn PDF document text
    • https://armenia4d.com/contents//files/31994228494.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/2563199573.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bad189898d8a1837bca3ac66dd62e605/37065780879.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8b66a789c017c2c00a8238364b59569b/motugusadaluxaveduvuzeb.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094808d40441---54861721715.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d457a83f---polew.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/77018837449.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610490379ffd7---sefusitejug.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084675e1ba13---64302098626.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/jolimusuketerefeki.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e473258c0736ad0c2d5b54cb01dfe9d3/dugitarugebapoborexuda.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_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 11428 bytes
SHA-256: fa0dade6e9932741fdf35a4f902aa290d963139ebb4919065d50e96b5e23c727
font_01_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 17024 bytes
SHA-256: ad20184b42692ca1c54f80b32a7b486dad27de5eb59cde33feba542563a48ace
font_02_sfnt_off000140cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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