Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b89ab6185425866…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 13:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edc3f8a8c1b6e49ff784e57fd83acf49 SHA-1: 80556e13eda967cd412c31f97bac854c9afe2088 SHA-256: 0b89ab61854258662168d77ce49c4656a302bdab75cbef0b9f74b0cffc0a2a04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://siamsnail.com/media/userfiles/files/40485208974.pdf In PDF document text
    • http://rnralpha.cz/res/file/megupofenabe.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nazadapajabagazujerisivo.pdfIn PDF document text
    • http://geraldinekilkelly.ie/68986253274.pdfIn PDF document text
    • http://unseretochter.ch/images/file/34124386608.pdfIn PDF document text
    • http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/fupolitezagi.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/79850289965.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95869925811.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/67647084106.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/vuvirel.pdfIn PDF document text
    • http://airfa.it/userfiles/file/ribipararomomojafi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309a0ba1cc0---38475799701.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vesevixerujakubadanavulip.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fabiretagivus.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/waxezuzuxarelitewixesolar.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/nagodediramaruta.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c61e314a0---675042049.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613317a35c007---71915617954.pdfIn PDF document text
    • https://agros.net/uploads/file/mozuje.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/buruwipovelis.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/46597439864.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/43645167055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+bluetooth+hd+audioPDF 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_off0000b7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BF 10396 bytes
SHA-256: fc6003ca759a4590dbb2ac1154422d093073d74a318a765f84695421e76fb9a7
font_01_sfnt_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 17384 bytes
SHA-256: 6ab6b987734940dd7f8c848d7e3cbd0b31f41de2eaf6d5e27bab7f83e1d2a312

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