Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10adb058a81240c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 09:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1dac235b6b19160c0cfa405b191e82c8 SHA-1: fb1fa8ec306fc9cd25394041af49493bf3b13df0 SHA-256: f10adb058a81240c454af126784f97ab92a93c5a82f220925fe0e5a8bfa348d9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests the sample is part of a link farm hosted on compromised infrastructure. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/3ks7iq8sok3k2vm2hsphpsa3a4/68305359046.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b640f095938---sukepudokez.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec844ba650---xopero.pdfIn PDF document text
    • https://majubesar.com/contents//files/bajawoser.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/91965031286.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/37646903628.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/tojiwefosozojutiteroras.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6a02d9d5---84166700716.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7hpu9lr1qnuauiukgd6kihk1t3/28381068424.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bf9a7c1735e309ae4c7dae161dbc6a63/turobis.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/wevuxibipukavor.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/wuresiveroxubijakiz.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/79553558302.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/28112506729.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d0c2061c38263d7c2b4eef0ed4de6c8a/jopitedilapuxadesopow.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/buvowiridumedesonin.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4e90c969ba83a5a6b268060d20637317/28120710847.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/80e4ad324788aec38f3e827b6911b295/mefabef.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7999c772ada726f32c0d007d811df8ea/nazaxapalovawibamiwag.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pafigetewibitigeni.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc1754e39---gezisi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4e5954674a0a9e595e4e19b96bb97d63/12766482626.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-3/20210703155519570442.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pitepovirikerelinivonuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tp+link+wireless+n+adsl2%2B+modem+router+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 14784 bytes
SHA-256: 7037441203be9e73221b8102d9a395f4183d9c85193d7551ceeda1155b1669e3
font_02_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 10912 bytes
SHA-256: b8f2971352cf9c69c58a68e375d9ec29be968015cece8037fe6e489d50c164ac