Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2299559580f3d96…

MALICIOUS

PDF

83.9 KB Created: 2021-07-29 21:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: caed42b444a41fe5362e2e83ac145d22 SHA-1: 3c1fd6a5cf16bff171a190aba0bee4a3441e2537 SHA-256: b2299559580f3d96899a741bbe66a17330ce58f368352a3b0cb84dabf810eb76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=chandni+chowk+to+china+movie+mp4', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://pistant.ru/uplcv?utm_term=chandni+chowk+to+china+movie+mp4 PDF link annotation
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e0c4b4f3---23408702934.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210705_084337.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/jexetu.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/rodizenuvefexuwo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a88827fa---19893012599.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/98641321729.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb3eda877---jixafaloxakaxerizinime.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8da45d08---46337001704.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefb76b38f---xapixenipasivavunaxuku.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160828688d174c---59424936997.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30951838150.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lejiri.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/tigoru.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/617f3d90d6039c18d0cf62908afdccac/58172204226.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/fixuromigifof.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///31620094060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c94bdeef---gumakixeluzowipapesodi.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/73641150464.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb10aa7d15---vojujutezezomapax.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/79433519660.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/mmferfpbvk1dve2oeeg25dbg31/kigevamomefoget.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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 18152 bytes
SHA-256: b6c465a132e52828d7b1e2f8f3c66b7c13ab6a17d57d5997b31f87ab3cd2e6ba
font_02_sfnt_off00012876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 10820 bytes
SHA-256: b7836a0205e7395f84af31f9cf8bf18661a53317b39bb546a6065e5cd33738b6

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