Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cc47f05a443e10…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 02:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5c9d6102efc33da1affb13430fcab7f SHA-1: 48702d4432888c8b99509f4ad8935900e1d21c0b SHA-256: 17cc47f05a443e1030466fe4a295d53b9ada754589f240dc175485158d77c0a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://bukharageorgia.com/sites/default/files/file/jemaz.pdf In PDF document text
    • http://bannermaul.com/userData/board/file/vaxivuzexivogi.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/71461469021.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/basiduwalakogujasugozum.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/48364159686.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/35393992418.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/dozixojanomovakifimavazex.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3f1ae347e1b592593b20c89f6625b66b/99440707128.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7fc282efd---80923694645.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rnha6mnpomou7jdbsdfqsmnuc0/51467701993.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffccfab1a7---24021114785.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c87e28e11---97262648312.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/77794255074.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262645abbf8---gokovop.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/waniwebowuvuwawoxepo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49d55bf7f---5774277818.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/36705336340.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f022ojepmr2a14pseb45madgga/56703938106.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/51775134390.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e5a49b81c14a95296ae512710e6e3ba6/43444898974.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/voxiwoxitasera.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa582e9685---giluxotuxami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2006+dodge+magnum+owner%27s+manualPDF 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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 18992 bytes
SHA-256: 87f3584ac47054b578a1996eb7d37a0990abaa40f61d3e07dab79bd519410372
font_01_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 10936 bytes
SHA-256: c0f26887b05e98ec7778a0242792a24a06ccf0579bd79f56ffe01fdf95389ff0
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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