Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc29d828b162e9e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 17:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ab746c1e0b1315d785082b30b73979e SHA-1: f8a88d387d26b867a7cdaf59959b51fbd23983c3 SHA-256: bcc29d828b162e9e306f732de6efa5f14aaf38fbcf1267070a321ae551c4f1c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised WordPress uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://philabc.ru/uplcv?utm_term=3d+circuit+board+live+wallpaper PDF link annotation
    • http://doggystylzgrooming.com/admin/photos/file/77668204097.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/parufipifaviwe.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/boxivexusisagepikorif.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xesabekiluvenanibosag.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/25660089220.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/95058182888.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/gupidufatidunepumukaniz.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/roxoguderon.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/dakagomenupasowax.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/52746207376.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/dezetebi.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109171537182254.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/wawojamuxagexejojotobek.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/pibixofotulevefaxiloxaso.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/90624809780.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/44846956041.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/37588641233.pdfIn PDF document text
    • http://klaaswester.nl/img/file/64523413865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/924cf51e04b346d628c2bba947021718/wosifanegedaxibekuge.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109121454029811.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/10848712885.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d231a8d15---9953302529.pdfIn PDF document text
    • https://songhong.info/userfiles/file/59225226425.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/foxozusetubanew.pdfIn PDF document text
    • 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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 10700 bytes
SHA-256: 7cb8e47a9a9a05c649a2cee490634aee209452290d341bd708a91a395ce30a89
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 15924 bytes
SHA-256: 2cc0943dfa5107cf02c1b988ccac28df1e10e39b446ed75f7d6cd8e0c19e945c
font_02_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1