Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6bf322f7365de7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 20:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 941569bd12a65170f3c18503908611c7 SHA-1: 8e32648396d504484b9ac427c606991b1c30842d SHA-256: 0b6bf322f7365de739b112b2434f47c178f324d7427662077884fa3e40a22fa8
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall phishing and malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=free+pdf+to+epub+converter+mac PDF link annotation
    • https://lasanisports.com/files/fisej.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e820f6886c---91228822151.pdfIn PDF document text
    • https://argumentua.com/i/file/86759003087.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/85177693447.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/venitelikerireme.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/65418287784.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f602ae6d56a---lamifisimem.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/72476970466.pdfIn PDF document text
    • https://terracell.pt/images/file/vuxerevufenavelad.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6099c5ce2f---woredo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/46785869378.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/xidedogelalif.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/11984835029.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/51600808649.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/8043230679.pdfIn PDF document text
    • http://imaginove.eu/data/Files/18644401342.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/62536775799.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/91982363287.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/78844946598.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/161246754.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970ce29bdd8---77651101686.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/3736885293.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/42382188863.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/98200993702.pdfIn PDF document text
    • 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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 10756 bytes
SHA-256: a254abe288b81a7153be225223d833ca72821cd77c88a97cc6a3b52d9dacaf37
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 18760 bytes
SHA-256: 8a852a89d35bdb7b30129ceae57e3fc31ce5be4bc6c0bbac27f704ea813e02bc
font_02_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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