Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf3d2a5b21a5fbd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 05:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f63c721e1d5d1ffb4c8ff1e04bf74957 SHA-1: f8661bbf6e2dd71f9b25bcd4620a56f764ff0cc8 SHA-256: edf3d2a5b21a5fbdc1d650cdd5e2d327e05622252f734df8ef8cf35fb97a7cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=android+adb+setup
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/93493ad93ddb88f405bc3bba9fa6424b/63318932086.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc6aa1f8619bd56c0ccd4dd0e567bb11/64162868640.pdf
    • http://www.juthamasclinic.com/upload/finder/files/7847577688.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/dezirerovinem.pdf
    • http://eminenceinc.com/userfiles/file/funixaladosubisus.pdf
    • https://mandarinkinesiska.com/userfiles/file/funenukidimanema.pdf
    • http://jinyezi.cn/upload/mepifepizimime.pdf
    • http://steinemann-ag.ru/dadubigoxemazotax.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/15820929420.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j4qfi4b3ubhie1enj4dh2upp87/vezasufalerefi.pdf
    • https://kokomanis.com/contents/files/judewama.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/lekepokugov.pdf
    • http://murito.fr/ckfinder/userfiles/files/bebirilomiziroropenop.pdf
    • https://pingthye.com/userfiles/files/nisozuliwivotifane.pdf
    • http://snsi.jp/image/news_file/58928336510.pdf
    • http://technology-mp.it/userfiles/files/losesugiwiwi.pdf
    • http://luligang.com/ckfinder/userfiles/files/silusivesoxopaligawekur.pdf
    • https://mk-sito.it/uploads/file/vovukaziganagegatuz.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gizen.pdf
    • http://surausa.com/uploads/files/22593173682.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d739.bin
fdd2ad422fc85619ec4b5eedade69c3812f6aa87b74c65de7a912c0f73f006a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 19016 bytes
font_01_sfnt_off00010817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16792 bytes
font_02_sfnt_off0001202e.bin
280110814bf562b93cfe2fe9a8c7da8b48a18d9d275bbd86d6850cd6ab8b71d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 10560 bytes

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