Malicious PDF — malware analysis report

Static analysis result for SHA-256 20159c90f34c88d5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 10:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c434e6d899d72fa748ce108c86ebf630 SHA-1: 47fa6b51664137378457046f4cfaae2c8de09d17 SHA-256: 20159c90f34c88d5bf66c4feb69bc0b1bd400205a34b48425d41be83516c8a36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lnianemarzenie.pl/userfiles/file/judazujatoxumoju.pdf In PDF document text
    • https://kaptenhoki.com/contents/files/5872498964.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/94607712783.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/zogaxapasuvavi.pdfIn PDF document text
    • http://mc-opony.pl/files/file/negeniwatoloza.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kogelelirur.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad90b53c59---tifufiraduwaziwi.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/lotedasuf.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/bizinujoripifidububedi.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/30319844549.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cf998549---potifetaduripasasetiwo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/vajojitimavewafapofazuxi.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/17712163774.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kopakagozozenofa.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/12727143883.pdfIn PDF document text
    • http://guowangcable.com/d/files/39112781886.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210914101214.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/jebadog.pdfIn PDF document text
    • http://esangsok.com/upfile/files/rivefada.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/gatorapab.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/35726459259.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab3e19d2---jasazemodugogomigaroninot.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109081854048110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=xhubs+apk+iosPDF link annotation
    • https://mediaget.com/userfiles/files/54992057985.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 17940 bytes
SHA-256: b5b46a0ddb133daf28144d8a653f6a8cce7b271ea964881f48b2d9044a695d42
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 10208 bytes
SHA-256: 6c71f15a6488d29aee28ffd475d08d0c385eebe98e640c13a3374a141e7a7219

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