Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf58c8a15dcf4dd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 21:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9fdbe331d8a402c2b2fc0aaaf5f1c623 SHA-1: c10f4f6902b457c1d366cc80f28a3d9bab7e2f76 SHA-256: daf58c8a15dcf4ddc950240269865e28347589487d76a1e2717b60e03dea1686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially harmful content. The presence of these link farms suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://kalimati.in/userfiles/file/surogeparepovukuladaj.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/13156862243.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/82450777593.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/58572c9cc39da5d6cfb9e7437178a650/4694252917.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/jowikalokoriganolopen.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210907192033.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zagusewo.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/mopolusiv.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/dfedfc48aedc6fcc88a1389623f30fc4/mibanojejolagadujudagusat.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/vibulenutovubaneti.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tutepavunusojobokefoliwiz.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915160607.pdfIn PDF document text
    • http://lachina.cn/upload/file/xujuporogepegusubu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/wowodesanadujadusikibates.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/40574043063.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109202011392588.pdfIn PDF document text
    • https://yellowstonewildlife.com/gudafusalipixilu.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bezudor.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6b801f2c---99069003169.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/42657180954.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/41243271362.pdfIn PDF document text
    • http://asustainable.com/global/file/48445509637.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/34237498216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pirate+survival+mod+apkPDF 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://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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10708 bytes
SHA-256: 564ae0fc4c0c30060a9ff85e32d4256644202229911b997a69a33b5e79a35d28
font_02_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 16176 bytes
SHA-256: 34d94cd8f441373447111c6a980ece834cc599388cb92f0814b560fde4d4f5aa