Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d98d05e886c11d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 23:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d7d237d064afdf824d8317461f581e SHA-1: cec1c98fb02ddb58f2a7ba6d6fdd45128c72f121 SHA-256: 46d98d05e886c11dcdb7c2f3bbd499faa3d5f6c5698cf6422d0dd216a1c94006
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ziva-muzika.cz/files/file/xitebajadapazoda.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141420103915---91691263840.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qev2t1btm9jp1nrarhe6ha3mtf/giliwujiragezugetep.pdf
    • http://galaxyjewel.cn/uploadfile/files/ximametajowatewujeti.pdf
    • http://vuonlan.vn/data/upload/files/51276717012.pdf
    • https://jeneifogaszat.hu/cikkdata/files/78464286697.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/15841059416.pdf
    • http://ipayon.com/root/FCKeditor/file/28428687406.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/jenamakilogefovumijozav.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa28855ff---juniku.pdf
    • http://satyavnetworks.com/fck_upload_images/file/vuwogugowok.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/87054776173.pdf
    • http://www.koeru.eu/failid/file/64264256316.pdf
    • http://lasantitosrestaurant.com/userfiles/file/voguwijegejidaruvujinix.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/71849597581.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/nevijanafutixoze.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428860ddfc1---86076350608.pdf
    • http://tomei4x4.jp/js/upload/files/teguxosowenizomixawazu.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/ziliv.pdf
    • https://gyn-koe70.de/obrazky/file/balilukaxolerubawomana.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/vobajezusewovali.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7a9b6926f---63728059831.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161469d84a0e1b---42744710668.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/81153010790.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=uszkodzony+android+w+telefonie
    • 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_off0000e083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 16792 bytes
font_01_sfnt_off0000f89a.bin
08255c1f5acfc2f501169e2bffde8748b941fdc6de327819ed60cecd30c23a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 10708 bytes
font_02_sfnt_off0001116f.bin
5668859d01679533411ba233297f83b7b2d22ab30791fac95a71e419addf97f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 17712 bytes