Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b3991eff8bd9da…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 23:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3864ecaca73f21a5d7ae3b78ddbcb4aa SHA-1: 40b21808e26190c419a77dcb312008f6bd1ee0f7 SHA-256: 19b3991eff8bd9da02c10060d9df9072eaf923add78b5a43c00866869e8edb5f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://psychologkmalinowska.pl/ckfinder/userfiles/files/kalusevusalukezani.pdf In PDF document text
    • http://tvsporedi.si/vsebina/kajukirumemadaragalolel.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/sudinulufifegu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba6773cd7---gakutameraluxo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b391a058---39462124360.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/pokoga.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gigon.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/25448426232.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zozebotivuporurus.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/wigevowofe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35afb5f52---wuxuzusasine.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/waxabisemejivikawajesibu.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tafazexo.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/dojidemuwirizotenijemo.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/ec38f5f737e3d325f8a36f085bba786f/61118954993.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3hd5ueblq0s203jfvlji0fdrg0/lixepeputujefexamodozi.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/rofoxumaf.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/79239512560.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/7844102234.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/38611732709.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66073149536.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lupani.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/186461f2f3f134596bab30d3fba33a41/12139156629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asphalt+nitro+mod+apk+latestPDF 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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 17144 bytes
SHA-256: 1cde0fb3bcf2ee3a997e0061e08eeb7c97e94def6591a6f67559734724dea4b5
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 10728 bytes
SHA-256: 90b6ff3d6d900bf122a00b6c7332910b323e2156dd16c8435e326a7795439623

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