Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5e7997b74b2094…

MALICIOUS

PDF

145.7 KB Created: 2021-06-29 02:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c18bd55e4f35ba3ebb3d2bd362c3d86 SHA-1: 29d2546d6510ce38489e23a2aa0a5ac79da55d4c SHA-256: ef5e7997b74b20948466f3de3c5a9c649d1739b85761d797da20dd389b977e2b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://philabc.ru/uplcv?utm_term=orthogonal+curvilinear+coordinates+lecture+notes
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6120d2f5f9---gamuripusabojop.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/milepamogapukixureg.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18fa0764f8---11446299062.pdf
    • http://poiskvod.ru/images/file/baxetofagovinufarokumilok.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b6d00b6422021a65b809dc2466ae975/pibifubabe.pdf
    • http://byty-pardubice.eu/UserFiles/File/kobamanom.pdf
    • https://artasedanasingaraja.com/uploadfck/file/69771730416.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204489a695---sezoluzolezizokimevuvu.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737fc821430---bugofizufek.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd38126a5c---movabuzatasetuv.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed115b9d5---70172592094.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/46ec3eaa9e77a193fc55b2d380f1e455/kurus.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae23fb9d38d---powapelegaturaf.pdf
    • http://littlepearlbooks.in/data/eimages/file/54059701530.pdf
    • https://asiquim.com/ckfinder/userfiles/files/wodedawapiwenezagobizoge.pdf
    • https://benqmusicworkshop.com/fupload/file/53182967780.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kttq14hfle20jgu7s0pqqnr27q/xagifezutinoxita.pdf
    • http://goodtraefarm.com/ckupload/files/vesinowefuwijer.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4c430d57---65079038324.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55bc95308---32172467845.pdf
    • https://weddingitaly.jp/images/file/ruzejalupepalebikasefowok.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/33a269a855ba950ee5801732d0c6c587/81715637735.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2cf0d23a186d97f958e325bc930fd922/boximefa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b901.bin
4a77734fa91a1d8abbee79c3b5a7b9bfa04fdf0f95f2be2b1b60f9dae3a85e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B901 21496 bytes
font_01_sfnt_off0001f183.bin
c316329b3165f5a5f82078644bf803c896074df0686808610fde50f9c9fc13a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F183 16336 bytes
font_02_sfnt_off000207b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x207B7 16792 bytes
font_03_sfnt_off00021fce.bin
d80465366fc0258c8c9f6a9acdb6f9251074b5bf80bec2c2ee6e59dd611d61a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21FCE 10840 bytes

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