Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb03bc2d412ebc3…

MALICIOUS

PDF

73.5 KB Created: 2021-08-28 05:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e06018f3205be3226e57d444d3e5bd9 SHA-1: d45c45f2745f34a5c23ff61d01ed113f4ae7a563 SHA-256: 8eb03bc2d412ebc310d44fd51fdc3d182c4e41c334901b8201ae129535495577
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://al-bandak.com/userfiles/file/tokisanewotodovuzupoz.pdf In PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/2968892193.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/tozikinopiwinubabidib.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/pizowigufew.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b59e0cfc---selor.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kirukajefalolali.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lofusalixurax.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7oudr5vf3b8kovomjf59jc58h2/35633148937.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/nevavunogasoje.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/napovuzenojujewawirulas.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/dowededinukabero.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/81299759616.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088c49b5f7fb---73706026224.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/napifobatizet.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a0db7ab2---85960874772.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/89158438787.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/mufapafasekolazivov.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/42300050865.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cfc2a54355bd19dcbbaeda8a4e77f4ce/nazulo.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/94777218514.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0q2r8oi10tmp3vod6nffitudnk/85219544048.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/14e355c8b25f03c668a0d1d05ffd01b8/zazebavizexojedalo.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/67782666640.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/vusewepazuxeniw.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/riniwuzulasodaruz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb5f34dcb---63473450933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=identify+simple+subjectPDF 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://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_off0000c1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F8 10836 bytes
SHA-256: e7760007c9d21edd3eff37c3135e51d641a0c0e2d5aa89df8af0cafd672fae15
font_01_sfnt_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 15532 bytes
SHA-256: 84a9fa86f7db2cb1db5cf2b9510bf2281698608eeebb96f6034700b08011ec93
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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