Malicious PDF — malware analysis report

Static analysis result for SHA-256 631c85b282f674d4…

MALICIOUS

PDF

89.5 KB Created: 2021-07-10 13:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f54ed2b39cc13665ed589a524cb688a SHA-1: 62411c89c23535e831fd292bff09e739e3138d8a SHA-256: 631c85b282f674d4a7492e0d40b72830b7fbc14461c448a0c2eb9d89ed0ef339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://goref.ru/files/file/gevepojaxatidisugevub.pdf
    • http://phuvuongcorp.com/luutru/files/busijokisesibepeja.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ple47asgfe6isfirfj29ubp530/71591716032.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffe4a2ed6---tewawap.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a572e4d052---43747516347.pdf
    • https://catbasailing.com/upload/fck/file/levijeboxuzubejagixano.pdf
    • https://universal4shipping.net/userfiles/file/90209852315.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/54c8af994ae63d9146a84b4dfc35227b/zazaxijamowibulumamifawuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d2ce1f7e---bebaxu.pdf
    • http://akkoryazilim.com/userfiles/file/47941793912.pdf
    • http://uralinteh.com/uploads/files/27689629920.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa546af72---votidedajetunaxima.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdadf6af92---67998762033.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/pefubesodewilube.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ecd7e0d1---74819485253.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a6857e81---nolonuzupikofuvebapi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=travel+agency+bootstrap+template+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b5.bin
49e4036a3cd0a38ccefdb9b04fbf856308e450fae5a63bbdbfd0e0b87df3f89e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 11240 bytes
font_01_sfnt_off000112bb.bin
3fb79a4e419d09f86ba121e3bbf606501fb740fa5c72b634287beadf7ff3579d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 17500 bytes
font_02_sfnt_off000140d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 16792 bytes

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