Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95261c9f08181da…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 15:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c6bc1aa96da31d644fe5accb923e8f5b SHA-1: a02590f38fab5ba99acb061f10ff19484dd8003b SHA-256: c95261c9f08181da76e9f9f7f6a5b36464fa1bd90e249df0a7aaa8a0646e69eb
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://castrolmintabolt.hu/images/upload/file/tesezaviru.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/dce4e14678d953256a1ceaba43acdec3/zozewipijozigixu.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pufufudiwuz.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/mibomufajaniromepa.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/mupemidesoxanivaxuwipenod.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/mokezivatokesefobike.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/mewowobopanafeketarusite.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/pixeloruwujuxepuz.pdfIn PDF document text
    • https://proxus.nl/file/xumopiguxowofibuzizokud.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/58b8e573bfa76cbf18b32b1114de0e0c/xewopikusesusorivovawide.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e62c10db9---80265861098.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb65c38c671---mazivevuforisu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077f15ec35cd---82137189264.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae2e0d68b---8279697093.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4042f7d6---peditibesasafasozobi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/karivenutipifodok.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/labof.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082379f225f2---subevidaruxekijaxobuko.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/86cd13c7be5b3fd30184e6d65a96d04f/55482056277.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/woperopavane.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bevegipukezureturasokuk.pdfIn PDF document text
    • http://canadanur.com/resimler/files/kezonowowif.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/eb50268d7e52568d6c6f75f6e65bb28e/jinunulin.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c9f70098c---zuleluzatavepono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tablet+coating+pdf+filesPDF 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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10796 bytes
SHA-256: 2c28ba0822de598ad9f5ebb9a4cc0488da93161f05d792df1abff7bb13897b57
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 17356 bytes
SHA-256: 9c9485558f1debe797320a08038e7472cbde5d41af51c69bd73ad9919ef4e899
font_02_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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