Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b57b90f16acc044…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 22:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98bfb20545b9560abfeeeb13f6ad9b86 SHA-1: 39d35597b0333e1175110caa1512df2d62b4910f SHA-256: 8b57b90f16acc0442ae38148ad0158aa64625a7cb62cabee4eff8002022ad7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=step+up+high+water+watch+online+free PDF link annotation
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/19474588604.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc7784392---49083883759.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34954127114.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kenenaxu.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/bexis.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/62kkm64vv0mvn467t3a3l86ko5/gofodezo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613be90fc4512---doxoruluwilupulegomuxe.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/vibexidofunazo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/34fi1ttbjekdek2a3mt1anthqd/zabafirizagolexubepodivu.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/gibujujufezepa.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140affc11df0---88077163196.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/dawudujopitebalowisiwegu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210909203553_wf631g.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/duloxaxudilanenadusuxux.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/48337034324.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kebulep.pdfIn PDF document text
    • https://faceless.me/userfiles/files/2224997451.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16313518562124.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/58787294426.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/934639aaf6a58c468d2d4af9f3ecc583/lixigeziga.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/zumogifixawuzo.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xesokukulawaril.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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10852 bytes
SHA-256: 6e49c7b7194f1b54f55be6da547f77170be0371aa1a217deff31af7bb3b8d195
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 17844 bytes
SHA-256: d4fa7eb7a7b022f1d7ed19caddb2d2ac9df534b31335cadb146d64707f897660

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