Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c943996e1ad74a4…

MALICIOUS

PDF

100.6 KB Created: 2021-07-07 01:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c84b125afa8a9c90525a141011641af SHA-1: 59cbd32554e0dc2ed4afaa2e6ec940b51335413b SHA-256: 6c943996e1ad74a4ef7d8bb7828e51e27c6c82f0714b2fb6f12bc552830eed6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised websites, many of which appear to be hosted on WordPress installations. The presence of external URIs and link farm characteristics suggests an attempt to lure users to malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a22acaaf2---46862441463.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kixejogu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0cf1c55e---metozu.pdf
    • http://fw-simple.com/uploads/files/49883149434.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8dvh0rrlj5mmrur485ktiqa7i0/32385566589.pdf
    • https://birotex.rs/images/files/26106336369.pdf
    • https://digireg.se/upload/pibexajemivujopof.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/844f3070afca441651d3f2edd0a82119/logasipoge.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/og083csfkveka4ikqng27md4lm/63030416865.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01359a69b---mazivedamejove.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4257ec05c9f4f4e13881f52cc29f5a53/77323996546.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608132e08be96---mononininivedepilovufeguf.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bfe7bd76b---39985305386.pdf
    • http://magnachip.cn/userfiles/file/20210508112336.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2287f46d3afcef4556b4c2f6d548dc7c/27204651785.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/488bcad09aef95d598505b56aae05ea3/futudimex.pdf
    • https://superchills.com/userfiles/file/13897452989.pdf
    • http://medtravel.pro/images/hand_uploaded/files/musulamus.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/67950200382.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8sur4bab7f902tk5cuma44fc7/wuxekafolozezaj.pdf
    • http://hurtglass.pl/upload/file/tewodetixizuwaxexu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608915c8e2195---fefowinim.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/16630726738.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gt91ovntja1a1qim0aj2kbc3a5/66610137715.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff56153fa---37970409163.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=beautiful+woman+in+french
    • 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_off000123ff.bin
9954b74844f17400bb208351d14a9ed5fb290d55dfc572c96faac8c836980eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 19240 bytes
font_01_sfnt_off0001550c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1550C 16792 bytes
font_02_sfnt_off00016d23.bin
e2daa544850c7f47505e7ed24a04e609ac193b82819b6d8eca050d0b5a681798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D23 10672 bytes

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