Malicious PDF — malware analysis report

Static analysis result for SHA-256 330193625180a172…

MALICIOUS

PDF

100.2 KB Created: 2021-09-01 16:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d790e9e57207d3ffa08d581f12042523 SHA-1: 0f288471b7657dc90baa3716613220bf94a6a342 SHA-256: 330193625180a172ca605c3292df7527e520ee7e832385c4f02f38a122b257b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=unilateral+tremor+causes
    • http://jaika.in/images/documents/files/57692239548.pdf
    • http://kapsalonindex.nl/images/uploads/regomajizofoxejonezuxod.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd717bb5d---toviwuzibum.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/49969935109.pdf
    • https://ludifrance.fr/userfiles/file/jedafezovepagujaxalo.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba53e68af9---xuwefelajutaduzugomuve.pdf
    • https://coebmsf.com/userfiles/file/kujufenojiliduj.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fe92a707b33a098fe7cda8630cba70b2/60844351076.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8908881f1---rufuka.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/56898734136.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/q87hgskjnmv7mlrs7h4ehvmv1a/36523896280.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zotixerofev.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f46426157d09afa94dacafc9652ee210/85835840208.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094911da7461---36390409919.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f35e70fb9---97893814028.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160717ebfae6a2---vujuwodalenamimutemim.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7749cdaaa4da167ce3e83500ed061d7/83725063914.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b9d1b48e---kunabufawumozosimabuj.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd606fc715f---56926385585.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/47907496263.pdf
    • https://adamant54.ru/userfiles/files/zomosuxukowefefiviguz.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae01edd63---wogusovuzunevepelubosib.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761099c9ad2---pefamikogofonitawome.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e81aa555c96042f52fc1e3c94fd9d565/lupenibijubifekodawaj.pdf
    • 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_off00012241.bin
d16f58e6d24c063f6ac73189742e99d21170587003a7a172c12225c791023be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 18428 bytes
font_01_sfnt_off00015254.bin
03bddddf29a78744d33c107994f3ee25654f977bcc1c0f84d8dd3a8a7c630dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 10496 bytes
font_02_sfnt_off00016a2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2F 16792 bytes

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