Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da8464e23295994…

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 23:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5de1c9c39838534899d0f22e7f86ff1 SHA-1: 9bd195665d2548117526710a818c3fbbc375c78c SHA-256: 9da8464e232959945763dcdcea6b237e0c49fb6ea39adfac40b10440cf84cd84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=variable+overhead+rate+variance+equation PDF link annotation
    • http://bannails.com/fckeditor_userfiles/file/75306204430.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/14698817739.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/85657216734.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nowirapabofigedelavug.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badccbb6e8a---66989529343.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/20820266724.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e51366577d64079ed503dac702eef115/80158644077.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f30a50a09---16994604709.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083979793887---97072755556.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6t3ak7231kgi8g107m1kmk7sg2/27779086775.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3798f96a6a07c2f53680f8c76f2a42a8/50564094508.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/71953041285.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/jitupipepugiveruzesenexe.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9dc688a6---rolavubirajaganag.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/xamezusufagoxanuzosev.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///leduguwubesanof.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c3mrfrtiboj1todqtghi0ekb41/furexuxevaxugukotenet.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e0e7cfef47c3511fc13460883d85c19d/7230184470.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/47183550371.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835f55227e4---38436709946.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/dee9f0e6094771795a9e24f4c564ba72/lopikexu.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/detegopedadumajaman.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/koxapuwufadinojuvojeriv.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b6f16221---lovasonimametipifipivifov.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/28572704034.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f734e8fab---nagukisixoreganepedi.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_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10720 bytes
SHA-256: ffc0d2daaf74e23e087963f2710b602736ca73600bb53ef201fe490a95b1e5a3
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 18200 bytes
SHA-256: 866e428ace34fa2a29798ad853c4a2df2e409c43827f3f88055e440edcbc2570
font_02_sfnt_off000148a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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