Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d148f21ad877a9…

MALICIOUS

PDF

92.1 KB Created: 2021-07-03 01:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f5f4c66e5cefd1fd7df2dae55a794d81 SHA-1: 479994d3b3c628ee58a9c8fe9d63cbbc62788fc0 SHA-256: b8d148f21ad877a9770985fa8b8bf43d2cb3c25c2fd0f6e6a564ec304d9578f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised websites and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://biancoacolori.it/userfiles/files/bemeradofezezowegomev.pdf In PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dh7tv2h8352a9d84u06okskcco/gulagid.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4b1f0faf9550480be26bd88ff0ede8a/burez.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/a1a3d5drdcp41gmohio0l6dkrl/tokulerar.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0a1636c230ff156d8d1595975e4d6998/puzurivivelibelutorivo.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdf064e06---xugajaf.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc5a9fec6---zusolutagajamivufanino.pdfIn PDF document text
    • http://bjjiffy.com/upload/wodoliwena.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3a7dcfd6---85506602573.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87905603676.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/bigemagazudenamejanalu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/71839460091.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lukomakuxunajidafun.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/af78fec5cbb16e12a06ef2ef53d9d394/duvemataguwofen.pdfIn PDF document text
    • http://mp-journal.com/media/file/gabaxo.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/82781473101.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/baa0e2623d3b8d599cc2ef01d484b3a7/72477496383.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60982d9b1c---segox.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/43218772678.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61def886c6---4921776814.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ekubaofa3ocla3dtvvlip3vnlr/tufuded.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tutuzakolapixojupewazar.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/aa5bb55a44521a53ec962e53aef9b303/wusonipixatasoro.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3a1e0700---68882848053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=questions+and+answers+on+home+inspections+brochurePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/noxodukabaz.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_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 11116 bytes
SHA-256: 56b13f677a8a9a3936e79be027f10f4de09c892fdbca4fad65fd7d0507ceb737
font_01_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 18056 bytes
SHA-256: 1657300d0f0811c0091e56a8aba3c5bae476ea14a2bf96793e5cc61607ffd1d4
font_02_sfnt_off00014ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1