Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2291acf5ffb501…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 10:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df1a80fddcc8c193f596faabae575aae SHA-1: 2de62ddfea35146225aa4272d00f005041da9f35 SHA-256: 4b2291acf5ffb5016173d724e7e513ed060f71d4531e97f162de2a36e186c9ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous links to external websites, several of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://garglob.ru/uplcv?utm_term=jumanji+welcome+to+the+jungle+full+movie+eng+sub PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/211ebcd2dd7271039ffb54776ba6d732/94734271712.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/memekidelutikukares.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/zabugokegesiju.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/pulafavi.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/3792982409.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bipefuseli.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161470dd70baa6---6554762934.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/74764487865.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/dorilud.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/94352833760.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210915_AB004EAC67252B67.pdfIn PDF document text
    • https://grancom.by/upload/docs/numizaw.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/lufogokariva.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/punazofemake.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zolenegojew.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/41073239435.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mulagi.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/46113386186.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/doxerefifub.pdfIn PDF document text
    • https://ayurmitra.com/files/file/16116901691.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/naduporiwodal.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/babadivi.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/ripuwekazopiravuga.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/nitozorapuxisaruwuwudaso.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/geropadi.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/81947604363.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136938dc2e37---67433232579.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/nuwolitabewi.pdfIn PDF document text
    • 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_off0000b2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E1 15544 bytes
SHA-256: 24c45ddc8ec1cec5576ed7255900e10e99cc1354460915d85dc838673aea48b2
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 11196 bytes
SHA-256: fa98b9c3d019cd0ff86727986d8cb431b3d0a6de0db7f74fb7e2c8944d075cb9
font_02_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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