Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347e66263cac811…

MALICIOUS

PDF

89.1 KB Created: 2021-08-09 14:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5aa8b1d22b040c4e0553d42ccb07253e SHA-1: 5e637706f5df35dcc80c41ae23f29a5b507adefa SHA-256: 8347e66263cac81194ac1bdbb71576d0faa72f504db4056f6ac355245519b443
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, specifically by attempting to trick the user into downloading a password-protected archive. This is supported by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest an attempt to distribute malicious content or engage in SEO poisoning. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9738

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160868c2111fb9---18316357213.pdf In PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/91938929501.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/bepajizexakipotijufe.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85231477981.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/74299229016.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/42712366970.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/155u5m0aol7hn0frlb56if88a3/xewemizebudozuxovini.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db2da756f---8714601981.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/30016522482.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/91227057822.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/zozopumixu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607132422eede---ritiwunujolusod.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2300cjssnukpck6kvsp9q7jq42/38040481923.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/82865564128.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/16808109948.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/fawojozufisifod.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f673a045---50173867533.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/57467424718.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/94988225667.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/14105225673.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e482fca2---dupus.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/gokuge.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085274f70ee5---22578538657.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37520b0c34---gurolijen.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zogupuwaxunegu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496b24cd7b---liboge.pdfIn PDF document text
    • https://codecs.ro/images/file/wawodagelunuzumuwexode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+5+ps2+iso+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 18552 bytes
SHA-256: d7e52bcf997c6588667dcc17b558eb9185c82077ddfdbfb8b19ac04fef0ca880
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 2568 bytes
SHA-256: b24f6783c4332b8d01666b1facff3d07ba7f1b83221fb3631323eaccc656144c
font_03_sfnt_off000137a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A3 11324 bytes
SHA-256: 6950280bf2487f9f201d62cc66a62e555e8070d6f508304059e2b62aaf72096c

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