Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ed0f35dd615df…

MALICIOUS

PDF

83.6 KB Created: 2021-07-16 03:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1006341bf108ab844eda12471fae4a01 SHA-1: 123d17d2844a981b04a075d0375d200a5b0823b2 SHA-256: ef8ed0f35dd615df40d83e0c2fe301dd3a816fada9419037baec9b1667860478
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or are structured as link farms, suggesting an intent to lure users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://globalquestconsulting.com/userfiles/files/kiwej.pdf In PDF document text
    • http://kzlo.pl/fotki/fotki/file/kitirolokijo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f6fa9c02---komikofopimixorabadegege.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c586086d5a3---sunixazufatalox.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/61156925175.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rakonixabudodemowivokapig.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jegaka1d6ea23vb4cu3i1mfitk/tabipa.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d0ffcfcb3---35018401914.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1314820145---wovobodojir.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93268646919.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9fb695fbe48a0bc351aecc630c40bbfb/72767475992.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1fef4bcc4de36989f8faf8cf00763a46/23228256154.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd2c7b6cc---biduma.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/telegusaligi.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/89358657583.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a359271b1eb---xukopizag.pdfIn PDF document text
    • http://hibertek.com/image/files/20210624_183518.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608155db2f95b---zimadizoludalobafadudop.pdfIn PDF document text
    • https://service-panev.com/userfiles/41127254962.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6e2a870377b0affc4d1c00032b6cbeb0/nijemizewiregivur.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/f4leubkdt8b6tnbbp0nitdfp4u/12089025288.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7d3d407a2ce450fde485a57daf1e0b9d/40374227304.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d1c3a54f324471e0d1eb24dc0475f26d/94918729412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=certificate+of+compliance+on+completionPDF 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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 10504 bytes
SHA-256: 3417bed9f47b0a7df726b80e27c10a6c5ac83b46cfd05d26c2095a22cdcbfb23
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 16728 bytes
SHA-256: 4b2e5c8225cb80a79c68c0846b610426379d41e2a6a69e6f571ae3248f6b793e
font_02_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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