Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd1d4028f480bd4…

MALICIOUS

PDF

95.5 KB Created: 2021-08-20 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 368ff97f6097a38fe334e8b6eaf9b45e SHA-1: faebaef7704814999718bed0563c217f58453e45 SHA-256: 4fd1d4028f480bd4f4ae7ef8de3e615d1fdc1cb6baddf5f8504f46dcef04ffdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610723163a98e---37059031502.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/40cac58054685dcdca8eca772ebd9b28/1316305740.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/53864115407.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/xetugubapuret.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/wiwod.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/frlbidvvhriq42kjgadusm01d2/nebozi.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/49222985708.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4b1ee48c4---povimavekikuwexe.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4952ebe394b23a68259da45161be6049/visotajateso.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bt42mq6khhk4fgudtsb3fjd7r2/48599058927.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gugasanidukuton.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/ladalagakolukumiru.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/remuzixisilemuralisulu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/39735317814.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609020987e776---65743098174.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/46984231007.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/metofoladiji.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/17529981357.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/nuxezusodesez.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4169aab38e---sepularosoku.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/tinuxinixosibiditojub.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/39c543b90ae995bd1cf8015d66e7c3f3/rekiwanujagugibab.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0edcab759b---kamuditapuxuzapokegitojo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d08f6178087e6d3adcf6e14e63010da9/mesinijorezep.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/52753105dac376cc88d487979447a016/zapugepaporoduwimiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+trials+of+apollo+book+1+charactersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 10720 bytes
SHA-256: 54a1c7b153e870e03a77e58b6dc8cac528dacbb490ebf45dcc20a4c3205b5c0d
font_02_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 17376 bytes
SHA-256: afeb5de6fac6aaf49e191a3c8ded726562c84117fa631598c5db2bf8fcf53c6f

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