Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3e24ca5deee20a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 11:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6651ac6c82557fe316fb5bc8130da064 SHA-1: 03131a921757d2ae1a211207001b8bcb9ce1b473 SHA-256: 6d3e24ca5deee20a59f131b67fe3fc091d7471edaf66f959f76bf64cb0d1d598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=dimensional+analysis+worksheet+2+answers PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c53913d6773---vekoge.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/93t55tbceid44vmfv5ms6ob0q6/23656660274.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb913f95b---1427260541.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bcc1ed21778fe9f673851f136eefe3c3/zomimev.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/dupovatimivan.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/20965422736.pdfIn PDF document text
    • https://www.shinoda-usa.com/ckfinder/userfiles/files/xudodigawemakajudolob.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/95619136120.pdfIn PDF document text
    • http://clerus.hu/files/file/logoxufiwakigake.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105120047051513.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/magiruwemulupoxuzijiloso.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/im41pqm323skqf0ki9sgqt5qde/palukekamepari.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/70210844572.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210630_170207.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/83079688339.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/23297173554.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/98543283233.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/177979153.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/26906186890.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/jaxivawasani.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/06f5525c3d82e7c31773c98fe85287cf/rurajisasunedozitewanevol.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/47382845340.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/fivijogew.pdfIn PDF document text
    • https://soechi.com/userfiles/file/47148656360.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/wimapajipolabape.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/81665492694.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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 10788 bytes
SHA-256: bc67db84355cf6124e28971c28d5379d9da22ba2b9d8b1f7421b5525b1a0e77f
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 16824 bytes
SHA-256: 85937aae6b223570bc8caf42d1529f9eb863d0b1380937e00f3b59b8686cad44

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