Malicious PDF — malware analysis report

Static analysis result for SHA-256 55203875e8ff7c42…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 01:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8c50d3856d6650f8025c37f96455c17 SHA-1: 1657286a3f4131e46ea356a09978b02b892f11c7 SHA-256: 55203875e8ff7c42803022347cbb38eda1f381179086ff85f196ceb8c106cf58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The URL 'https://krisoc.ru/uplcv?utm_term=download+microsoft+visio+2013+full+crack+64+bit' indicates a lure for cracked software. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=download+microsoft+visio+2013+full+crack+64+bit PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d455bb465b---25921243307.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/zibozurowevolufexejab.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b04879102---36266144434.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/rujirenefidavagabakodido.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/35440069282.pdfIn PDF document text
    • http://candientushinko.com/images/file/falivovoro.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/16387412472.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/64034175110.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xufugijo.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/jelewe.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wedijejivuvofafo.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/97929814003.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/61669613202.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu3tg45c8104kg5rllm4tteof5/pafol.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459181ec9b0---pijumenemalopewe.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/3364016364.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/bavewo.pdfIn PDF document text
    • http://infracsap.hu/files/file/rexopetakedokuwigug.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/63797956985.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/fasememagepodepudi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319408c3081---75432331295.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133217a2c253---89443088338.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/bafefarexiwonakopekeme.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_off0000af49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF49 11704 bytes
SHA-256: fa0cdd7efd2aa88641d807b27d7be0f2bf8adb6b8a5071a4258522204608a49c
font_01_sfnt_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 14412 bytes
SHA-256: fbb876a4bdeb3b4a84dbd6cb9a79d40be83f81c18af87286c9c76f61070fc59a
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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