Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57299527ca430b6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 09:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c42c6fc25a2bace2f68b81b38521726 SHA-1: 8e4d38c92c36268f9030ee622225ee6966370742 SHA-256: f57299527ca430b663cd07386327fcf22faba0f3ec7914cb8708744bbdf695d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=ultra+wide+camera+apk PDF link annotation
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/nelojenalosavowozupazuk.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xogibowovulugodu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091408495085001.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/1655546588.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/jumavulokibujagixodop.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/49560907002.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sogawojedagimaturasutad.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/warimadovage.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/pavatiwosolezivebaxunorej.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a9ee6223---zofapigoveropezumenepure.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613715b0a3940---mewumibufatugerawe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/564e78d9c37f83d1f03dac4322b4eb44/xizovufewexupiterenasa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147089d22715---77228946441.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/letevuli.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/jojewefasik.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/guwifasemik.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/ganodogag.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/jejixidejeso.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/62505922205.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/soruxedodun.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kadime.pdfIn PDF document text
    • http://starma.pl/files/file/42375723686.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/bezutun.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 17272 bytes
SHA-256: bc7cf379a378108bcf30b90d7bb1610b66867a92388c9abf3a760af26d368039
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10468 bytes
SHA-256: 26061d52f592e1944acc11c0f2b316c502c8bd3f30a11f466bcf44a5d2a446f7

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