Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5e6f441740b6e9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93a8ca9b63d046a61079315612e77d46 SHA-1: 545896bbf8d9531bf5ddcb653b5caae703be37a5 SHA-256: 7b5e6f441740b6e9315ae0b0376acdbb9affa826bd6caf3c4eb4fcc928972fb4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://virus-safe-zone.com/ckupload/files/lovonizarifazima.pdf In PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/72364065070.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bixamizelumataziwa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b793f6d50f---sutadaxetipon.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1cd791e02be9644ed8d588b08044a665/rafonezat.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fa9042d3ac16d59e6a15538d4be04a18/mijosafotowugovelutiworo.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/86673363088.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e02e4cbc2f3---63601050535.pdfIn PDF document text
    • https://coevent.ru/upload/files/77704830160.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/62191525514.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/wipulubajoluwivupavidoj.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/mexas.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607739741daa4---wilisuzifenitajobuva.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210506235951.pdfIn PDF document text
    • https://ptogel2.com/contents//files/vovimevabove.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/18436982009.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/54055345930.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/53360429876.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0nhsuu2d26rgh1hbrmlmeesss2/tasetu.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/disodalujodorenilop.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/7545280976.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/aobmllitijfdepd0r84sc3080i/nutaderujivufabo.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/40709612661.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/mosezetux.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/fidazilifusufisopavezonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=friedman+dirty+shirley+mini+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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 19752 bytes
SHA-256: dcd77ff87e0b50f9afdc24d67f234cd90a8c89e7ba313eebf235204f5b65f189
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 10584 bytes
SHA-256: 6976769c44ba967028f9c258fe313a6c06e03bb7ec94d13c095923cddc0067be

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