Malicious PDF — malware analysis report

Static analysis result for SHA-256 3292b89802dc07de…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 13:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 262134aa53ac1bc7fc7bcc263dd616b8 SHA-1: 205d96627c801a90cdbc218859bafcaaf711bf86 SHA-256: 3292b89802dc07de6308e2378b3c373e0a0c9ca4069c4339992e2f1e368c0387
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or download additional malicious content. The PDF also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to phishing sites or malware distribution points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://darangyi.com/userData/board/file/zusesororeku.pdf In PDF document text
    • http://rimini-portal.de/bilderarchiv/file/mivar.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xuxoxixesulazugimabomuloj.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/gefojawumefovikudup.pdfIn PDF document text
    • http://indel.sk/userfiles/file/34561123221.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c64b62b38---jovawebag.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bosexigaguxunowoketiti.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/65259939238.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/48920344077.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/21573188538.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/kumudalibutamunewimijot.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/fozumirimisobex.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/44588733987.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/dutanorupexapilulumurin.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/rujobiketomuxiteb.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/933431094.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/69456986062.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///pevozimadivux.pdfIn PDF document text
    • https://apapunada.com/contents/files/48887291185.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146efe44a417---gozusevomusimazefuv.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zimoberiwibu.pdfIn PDF document text
    • http://spbi.cz/res/file/wuresajanirujigijuku.pdfIn PDF document text
    • https://fishboat.hr/files/32849157946.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6bf5014f---71057014684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=good+cheap+smartphones+2020PDF 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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 15008 bytes
SHA-256: e9acfbb1cf6f2139aec0217b5a3c180030c7a0cf798afe0664fa7b40ff25f91c
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10920 bytes
SHA-256: 40272301c2a01d7ae75dcda958c5b92a8fc5bc911074c7e11ca21055b3e9f36c
font_02_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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