Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb20bdf2267ddce…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 00:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ff8e314b499dc8dea1d1da07234dbec SHA-1: cfad255740a368bf1dca0819f392d26f8cce5e09 SHA-256: 4bb20bdf2267ddcec1f9dfed95fdb9430850cabc75a43f14a1bc59596bfd826b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5f1e4a89b3e0f7faf52dccf26b8e0b6b/badipofagin.pdf In PDF document text
    • http://ipceurope.eu/assets/file/12970789698.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/xabupuwazife.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u9dtuvu51798ek2u88rrkc5o1p/27034977826.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6acb98439e5d1820290fa86e1be65953/59911910424.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/97325812118.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/bagokipunasitalimupofusas.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jvpgjf4g48s19i93jnd5sk8p3d/vatud.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7e9c41d29nq56hh8bc52csfpe4/biwib.pdfIn PDF document text
    • http://ekotronic.eu/files/file/46935960468.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/45703160880.pdfIn PDF document text
    • http://industrialdevices.in/uploads/javuvepobunusudulel.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-10-03-02-44-EMkPtbQg.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/60529289168.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/318420386.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/76907901973.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7568c12479---zirixigiwakilababiwi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/mezasirisiduj.pdfIn PDF document text
    • https://advik.net/userfiles/file/81741226302.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7400omj0du9lappg4dvektvfj3/5267208186.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160700fb5dd11c---digizapividixegopupoxinaf.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/gotuwamelarovokovunotute.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/84078094090.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a453310459---bajagugejenomusavemezokol.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/2118592558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=small+pdf+download+mobilePDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10592 bytes
SHA-256: 2b12d78858de41e05af312fcf0d5cbeaad2846735fc036d277785562c5631b4d
font_02_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 17664 bytes
SHA-256: c77e3163a7aba3d915b3f0af9b91b9557fd408d52596b2f74e1e58de1d2fe7f8

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