Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3bbb442df821b5…

MALICIOUS

PDF

118.4 KB Created: 2021-07-14 02:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b12dd868ac56fed4f7d62d982550057 SHA-1: bef646e83962884043600932f1715d5771fd3ed9 SHA-256: 8f3bbb442df821b5df7d0c13c8e7936c7e2bb2a2f60732b0479b72d08817ec37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of PDF_JS and PDF_URI heuristics further supports the malicious intent of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goksirlambinowice.pl/img/upload/files/82997106663.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfea730c56---41228116140.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/gatibura.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/valusovulajevonazivubo.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/90047698100.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/vuxigeja.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/733e2a95bb05c5e4bb7270847706ee0c/81838621670.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb988fb33---6812169546.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4masln58iivd478svvqc5r7f8g/8450801624.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eaa5e994b721b21bdba049df41600fe8/18645028517.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/86046575331.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda68ea1e3.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/261pafb70ralcv0a78dcspmhp8/rovawi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/fakuka.pdfIn PDF document text
    • http://fructusartis.com/i/File/jitiw.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a66c3d486---xomaninitonaribik.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vupudowifi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0e907cafbadc20c68d91168d740ebdd9/58705940571.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/57118701598.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/gijutasogu.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/afhdc0i4t14lk723iqft1ophgt/tufefalalusevanakogas.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cded9bab9e---63859098828.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/63c7e75f173533f4be314de520fd35da/wilaw.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/19006098347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chocolate+oxalate+contentPDF 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_off00016c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C40 19388 bytes
SHA-256: f6a592ac25b80a0eeed26ead0bd6af95d1594dd6f6bf5133361579994515c8cd
font_01_sfnt_off00019df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF1 10100 bytes
SHA-256: 54e6bf0ac35923a4580022e4e6b69a1a0ae28dd9ba5d1195f77ab7bb41bca47d
font_02_sfnt_off0001b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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