Malicious PDF — malware analysis report

Static analysis result for SHA-256 420d000c97b4f44a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 14:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4002358dbc06a77cf128190b88b83a2 SHA-1: 1a89ccc7eeb32468219c3b927970f249134cc87f SHA-256: 420d000c97b4f44a47890de31f419cb9bd25c2f4dd8153a08751573d7b5d816e
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to trick users into clicking embedded links. Multiple URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 85 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://zovsh.com/Uploadfiles/files/59652164996.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/40234d978b96e1976d043f29d359f660/43583434515.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/poxisowikukubapobege.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ecda542cde7390aae0c7823c5c19786b/55019513713.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/19d5c9a903d4ec0db2cb466006d783d3/nepojisoteroxalelixuf.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tuh3eu51tn57ho7se70c2ik9bg/gepurulinuto.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ohur57ld8utuu6npgfq8lu1pe4/10202125154.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6444680e---tolokigumagujif.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/sibuxefowevepi.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/25431906243.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xubexukuxexepoginiwe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fccca886b59e3ceac18d32cc600b2c6e/wixafaxigume.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130634bbbe32---49286012279.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fc4aba227119e8b14d96ec39bab7182a/xixebolegidobulo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/74875836313.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mlhl28cbsi03em0vgfnrfjg4pc/nivuboda.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s2o2sunk6t7ii3hbl3tf85e6h7/39892475083.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/rifaluwipetuwozosijuruvi.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/61761624488.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c56e22f6e---lajonosu.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/gokokefiwel.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/lekerik.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043017032194.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuvezumu.pdfIn PDF document text
    • https://bdata.vn/upload/files/48030570010.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/giwepiruwedubefanulodefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ciatalgia+tratamiento+farmacologico+pdfPDF 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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 18900 bytes
SHA-256: fec112e098a38afa4ea7a7bab4d136902bbcc44966339fa051a33aefc8652402
font_01_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 10824 bytes
SHA-256: 511ebc2776602c8cf5a3618352352b5e7cd549ada21511121008779b4593dc0a
font_02_sfnt_off000131e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1