Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bcbfb0d56645ca…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 12:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dc65f5a211475d51a7ef92c24706140 SHA-1: f388b28869e13047baf61bebf913fbc5c53a8870 SHA-256: e3bcbfb0d56645cadcee079b838e071f664e7be52717501069b8a08d246229bd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, likely intended to lure users to malicious sites. The PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yesilderecine.com/admin/editor_resim/file/16004014108.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/26750352809.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86722631671.pdf
    • https://mediaskills.rs/files/39421311129.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e7051d2e879dff248ea9a6559e7d5196/72382547607.pdf
    • http://newgoodluckcrane.com/admin/uploadfiles/file/95040738411.pdf
    • http://shesob.com/file/files/37648113868.pdf
    • http://transchem-tech.com/Uploadfiles/files/xosuvozofazes.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/36114042916.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa257f7b0ef---vujukova.pdf
    • http://hieuchuan.com/upload/files/solegoxojagorori.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6073ef1db475ef165c75d8c71b808b24/22077600210.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160720ffed064f---14951988173.pdf
    • https://baobihungphu.com/media/ftp/file/pagadozo.pdf
    • http://mebelhotel.ru/userfiles/files/gonarasojene.pdf
    • http://autoscuolavalerio.it/userfiles/files/96971033094.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612707076c0d5---55940134620.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160877aa7c145c---kujisokijupozelonojukam.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/nekaxiru.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ee558791e06c4904e710ee97080b1440/pubulefozatefivezokulodi.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ede16aca2c---jabisebudogokejal.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abecead13d---madiwuxig.pdf
    • http://provia-events.de/pics/fotos/1/file/tadatezisetefino.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=housework+chores+worksheet
    • 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_off0000e71f.bin
46e99c4812ab82344e82304d5eec77c80dbbc35eb45a70bdcdda206bea0e7f67
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 10192 bytes
font_01_sfnt_off0000fe37.bin
1b0ba6994fb12549f46d761504021048fe1579f3a0ed1aebe2203d437e467746
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 18496 bytes
font_02_sfnt_off00012e7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 16792 bytes