Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b68e680db80497…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 11:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 656116df9a866bfa568eb86920616f1c SHA-1: 6e7c7f4cd7d9d763dbb32f4d0b49955627954433 SHA-256: 96b68e680db8049746764e114860256a89efa0e0072be48c3e56f87d39a153bb
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=wipe+cache+on+android
    • http://nuraski.pl/wsg/userfiles/wagetigilowula.pdf
    • http://morakothotel.com/file_media/file_image/file/mupibirugafaluropiler.pdf
    • http://wiskind.com/filespath/files/20210913213302.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf1363d2c---13415019750.pdf
    • http://fbrasil.com/userfiles/file///15699732868.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613e267a36db6---96527692853.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5c0aln8ffbhfb74s0tspd3es/65016563524.pdf
    • http://ruben.pl/ckfinder/userfiles/files/wikoti.pdf
    • http://iltorg.ru/upload/file/dozigoredumuguzenuf.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421939b4e06---gigavuwozideg.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/36727414814.pdf
    • http://eternoohydro.com/d/files/rajodisedewufi.pdf
    • http://suliaox.com/v15/Upload/file/202199233779608.pdf
    • http://kbo.pl/ckfinder/userfiles/files/16214887093.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wedarisuz.pdf
    • http://steelfurniturecn.com/d/files/ralabapaxidibobevewupojir.pdf
    • http://cartonwrappingmachine.com/userfiles/file/nufufiwetewu.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/31552741804.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613040390141e---68483071654.pdf
    • https://liftsystems.ro/LiftFiles/file/25103697822.pdf
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/rodonoduwajuni.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_off0000afe3.bin
0603356289c707b4deb5e929c6d5d20f22e5d4a802389ec573020f84267c2bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE3 10292 bytes
font_01_sfnt_off0000c6f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F5 16792 bytes
font_02_sfnt_off0000df07.bin
a47f0392525753ca37cca5973f501801954b4104101434f937b5271b3228d272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 15492 bytes

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