Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a74d550858bd0d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 15:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 956c0c91765679643d43e78cae3cd035 SHA-1: 424e0ce8a17afff4ca0d53c2c19a87625a880865 SHA-256: 14a74d550858bd0d361d1ecfbd9f7b4c293493ffe1ec37f0ce0d7349ab129eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, likely serving as a phishing lure. It contains numerous links, many pointing to PDFs hosted on compromised WordPress sites, suggesting a link farm for SEO manipulation or distributing further malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a phishing or content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/beabbb67e75a9ccb851120e33e727823/zegegovujuvanito.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/792b521933e20382ba9e3402b846a8af/runolelokilanokodijolo.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/519d291ab1fc1d54e908342f9a6921d9/7284331064.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/dusuporu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/36a8ae08407fae07c2ebd7c0df719522/23805922055.pdfIn PDF document text
    • http://telecycling.org/files/file/54414348525.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///25046521171.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa8a5b268---21202059467.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a50f55926999ed818adde8ee27415bec/21687469860.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/zuxokatubarupupadusaxale.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/87487204324.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/40939563296.pdfIn PDF document text
    • http://innotack.com/userfiles/files/rufilokaj.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/galepulafikagalusajoro.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/digujejanedutekifakenove.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/20902990128.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b453d4769ce---juxonafirizunuwoman.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/88546755926.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b09f5e8a6a990dee4cc62703ad8d0427/zepatanubidofikosobetinaf.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c375cbe70---dajetosomipemularelutarik.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4c3340c0a90610befd61c5ff4120959d/87062223539.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cvc892sgcq4iheraue3bdsdmd2/73629575603.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/90894593263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=liber+mesuesi+matematika+12+pegi+pdfPDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 18064 bytes
SHA-256: c4810c1b2b413bc99559fccd5df8d1b61fc33507c1d9cc92a6b827bbb649ebc2
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 11032 bytes
SHA-256: 0ff8b94ab745a3bc7cc9af19c61008c1c89aac309397aaf1d842b378b926df09
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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