Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a8eb81fd177f4b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-18 00:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ad8a68d6fc729cbd1d057833dd6b6fc SHA-1: 27603cc7b797cbba7cc400820c65488c8ac6d58c SHA-256: a7a8eb81fd177f4b37e8a2dcffadbe62ae6b1e5724793f40c3f27661d779d542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9df167d923---32404861002.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762513b5c84---libeg.pdfIn PDF document text
    • http://sgpeo.pl/users//file/xikaxanima.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/36355803316.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/50p44srb8tccg31okq0rm0la55/buvevaxeno.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087225e6db81---sizurunerutizin.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/67344942972.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5ec8f3f4---tujulazusobufasalasiru.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fc844ba9a8bb58286075b9776f1a4597/xisadanow.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0642281871---58262293144.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/podanulusamunosodet.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/59380507703.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b330271b660---delakinoxasogakitupere.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/deripamirinamutogugetu.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/57046239612.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a91b8d4d4a72bc35cf1e5c9590c9e9e3/guwinatexomojudivenibep.pdfIn PDF document text
    • http://bronia.org/userfiles/file/85400152622.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1561c0334d---65545382917.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7372642967---rogenusewotelirugenotaru.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a777704e771f5c61530aa0be4f7f54e/motinekudol.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jotavimidizewodupuwap.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba707c44b16---degenazejetilawolamod.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/ruginafejeluxuzirenite.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/lobati.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/pulikifuvomoxesujipiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stand+by+me+2+fullPDF 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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 17104 bytes
SHA-256: 06813ec160934e6055ecc1717232c564e00ad81cfe81f02149d09b88b6e6829a
font_01_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 10584 bytes
SHA-256: 13298f7de377917493a21b54b17f7d29f3d04cf935b06904ef3e03aae5e4f655
font_02_sfnt_off0001448c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1