Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3bc3ce83b00ecd…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 14:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27c6046a10b6dd8878433b7970ea85c2 SHA-1: e008f5105a74bd65994537568929fe1a4ce383fa SHA-256: cf3bc3ce83b00ecdacb63d554897db50a9d7faff843d80a47f9e3e49c0dcf210
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=best+xbox+emulator+for+android PDF link annotation
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/muvivaxoxuw.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/36080975800.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/nenilogixevevolemaxigab.pdfIn PDF document text
    • http://leguido.net/files/66043521755.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/zewanofozodavajixamafara.pdfIn PDF document text
    • https://defi128.com/userfiles/files/83739541803.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/maboxukokedejotojisimol.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613432622dfe6---20054100283.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/55737272070.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bonajumisaxatu.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/36819572397.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe2eed7ed---64204501896.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1ba3ef220c94e8cdde7722d982faa83b/97589756112.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912161558631952.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/dorusurofemovaxe.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/jebesurosenafanifa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2f659fda1ef2251420a7daec428b94bf/luwokilezakibiwumi.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/47516510588.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/zidaloriguj.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/gaxop.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/36038872747.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/fujikaxigiwipenisuwito.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/9482602487.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_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10912 bytes
SHA-256: 1c475602ac527c926de53eea270d0901f9f15e95e6c7c77a8b3d18a0ceb8bfb2
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 18612 bytes
SHA-256: 6698cfcb530bb6ef167136d6116c9bb6bb6a7ccb4d46b7bfe5831b6d687ab6ac

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