Malicious PDF — malware analysis report

Static analysis result for SHA-256 958dfaf0893688b7…

MALICIOUS

PDF

77.5 KB Created: 2021-08-29 04:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1122bd6eff4841a878726df638532ba SHA-1: 229935380e8c9058ffe1e7200b56b520d90d846e SHA-256: 958dfaf0893688b708c7b1723ebbc9ad59c15e2229ccb3da65e879a962f09e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=simple+arabic+words+for+beginners
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/601495ef8e3104600baf84b646947c29/koboditajekunoj.pdf
    • https://contactfm.be/userfiles/files/77037294342.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcbb7ca7a---58048273402.pdf
    • http://at2apigroup3.com/contents//files/2910077928.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6c5j4e3hnoutaps88ls7p03r4m/gekukagonenirovodaz.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/62998085453.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da7084f2eee---napogodam.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/26655920546.pdf
    • http://jjmcp.jp/userfiles/Image/file/takisukogijuravosapadese.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b92c3fb81---nigopigoxisedikoter.pdf
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/sasuwezu.pdf
    • https://villatoscana-pi.it/userfiles/file/6574154553.pdf
    • http://alt-1c.ru/userfiles/file/19478456478.pdf
    • http://abwlondonblvd.com/uploads/files/raxaraxazufajov.pdf
    • http://universalgroupautos.com/files/others/pewaguzolatafofasu.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77079bf7b---54091001570.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///52367182624.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/b87sdeg9sf1ot43r45dq5c98p3/tipelijuwuma.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/10596714428.pdf
    • http://anandtouristcorporation.com/uploads/46279563104.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abec9dc17e---27386257149.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210613_A92D04804E56DFF0.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f776e73bf---poleralejogonilebor.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d47165c8b06bc5f2cb69973eb737a9ac/21652590682.pdf
    • http://dges.in/userfiles/file/tomuxewowaxizajipepiwar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a1.bin
05681fbf5862a565bd07c3b481d3b91802f57fefef84440cab1a38691f447ee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 19072 bytes
font_01_sfnt_off0000f611.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 16792 bytes
font_02_sfnt_off00010e28.bin
f6051e32b60081ecbb151fc70800f2df26e0d5e14be89968d4befee14b635da9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 11164 bytes