Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f5d9bfe05bab1a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 06:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db2cb255003a03c339f19bbc3e9f3b71 SHA-1: 0e514a930e90f29e55976c035e914baa8b190b54 SHA-256: 32f5d9bfe05bab1ac808ad724cb65b3cae8799e648b664c0b1e4bfb4f807686a
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS upload storage. The embedded JavaScript likely facilitates the execution of malicious code or redirection to external sites. The link farm structure suggests an attempt to obscure the final destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yenicekentkaplicasi.com/userfiles/file/67910377632.pdf
    • http://mstreatmentadvances.com/userfiles/files/lofitalatusir.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/watas.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/12762707014.pdf
    • http://kp-technik.cz/ckfinder/userfiles/files/17596606010.pdf
    • http://mfcpavpos.ru/file/84793067222.pdf
    • http://jolanyee.com/upload/files/202109012124428653.pdf
    • http://w3-japan.com/js/upload/files/7349031657.pdf
    • http://grandioso.asia/editor_upload_image/file/gadiponidotexe.pdf
    • http://jdjcnc.com/upfolder/e/files/20210909201104.pdf
    • http://ingmarcofaedi.com/userfiles/files/8554980805.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/94592303665.pdf
    • http://apmnir.ro/fckfiles/file/27121418207.pdf
    • http://www.polni.si/Images/files/sejafiwoxawiro.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2085176bc3aa4fcf2133adf2f7e0f863/65640689581.pdf
    • https://morethancars.eu/uploads/edytor/file/jiruf.pdf
    • https://asesoriagade.com/app/webroot/files/files/52812762557.pdf
    • http://ngocvietbungalow.com/upload/files/86831463329.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1477e3f8---86965801432.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd5d6cd4b---fojuroduri.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=poco+m2+is+gaming+phone
    • 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_off0000bb5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 16792 bytes
font_01_sfnt_off0000d374.bin
6593e3cfba03bc7e0b0f44cffd045c8c9974c61aa13dd8334fe96532d6bcad19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 10696 bytes
font_02_sfnt_off0000ebe0.bin
adabfbe777b5bcdb7ffd62d04cef310e6cf3814fb8ce85ef95c73ebe6d623f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 17508 bytes

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