Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a0c23f64d83f1d…

MALICIOUS

PDF

100.6 KB Created: 2021-07-02 19:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d7c404b2d9715dc4ff6d4b61dd79417 SHA-1: edf2f35b4a9df74fdd564aaa672b760cc913ccea SHA-256: b3a0c23f64d83f1dd6d9010ecd87105b835e6232ab37dd2f0eeea171fb7b047b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, utilizing compromised WordPress sites to host or redirect to further malicious content. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d66b2e5567d3b54ad3eba019bbd159fb/61902391554.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/pafumufidowoviju.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ffaca7dd8---56334668759.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/23e168bb35fde3c6fcb1e973a576e0d6/3804953139.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa05bde24---lasaxigetoboli.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bfc5d6cd5abe955b0d5bf8caec8c7cef/kafaxaminiselomu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0332ffe2---kovatubavidogagupapi.pdf
    • http://imhkayseri.com/resimler/files/malalutifot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7010bad792---jegepapunigatupuwutaperew.pdf
    • http://casier-a-bouteilles.fr/file/37921282873.pdf
    • http://brmhn.com/userfiles/file/20210613070810_3aeby5.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/31956094201.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a278ca9099---wutapitevikutuzujame.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f0ec9e9816a56383785539edcce4aba3/wusiwire.pdf
    • http://adabaskimerkezi.com/upload/file/mokosijudox.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f051149d0---pirimex.pdf
    • http://best-infosystems.com/userfiles/file/bosurezutakilujigog.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7ves3drqjgadfiajds8lcqqhar/76640148160.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/4hefngkb95nparoeasru46528i/50725362861.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dknbuj7h283aqrvju7hr70pth/75974381731.pdf
    • https://palcev.ru/userfiles/file/wusudoj.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4df3f4eda34f2ae57a60b45286595f9b/13174370582.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4li4aaangn950joijddfirpld2/fozaxapifem.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb21b6d58---67881271779.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda7b5123f---gunufilitimi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+close+minded
    • 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_off00011e3f.bin
a649af56575db2ea8054aa3ab4c517e8af6be445f6ce82ac7805673be1b4b119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 10612 bytes
font_01_sfnt_off00013639.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 16792 bytes
font_02_sfnt_off00014e4b.bin
3625debfc26782c30d7f178c4f01f696566a05581624b03d56e6e2efb374745c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4B 16976 bytes
font_03_sfnt_off00017ad5.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD5 1700 bytes

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