Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c10a239cee0c70d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 11:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52e3a19d8d9e870595d582d92da75ad2 SHA-1: 7dbe03a9fe021e6089afd4ff6dc0e3bbe7f37150 SHA-256: 5c10a239cee0c70d723bdc2bd22cb8e75c2dfe07f134d75ad8be7541902593ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious or phishing-related content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maiodi.com/userfiles/files/35867220628.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c8f8cd56---doratilifu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733dffe562d---gutolariwuwepukaguwufiw.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vetebajoxeje.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/151f30e7aeba4732931a8b91d3f3fe5c/rikulewibode.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/fadazasesuwufopexoxiso.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/7865578495.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/af4d6b53233db375cc19816d98d56860/57905331358.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/43492815112.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/96379186026.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/188617d5de454aa11efa1398a0c012f7/73899937622.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/wewirujugogitogajovusivi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac38ebee94---94518654215.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/56834001396.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/54972037401.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/38644292700.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ranapara.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d894a1ba23---jarojesiz.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zokudilagex.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/jibuzuxub.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/97580414364.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/kmeilrq89v20rfs2tpc6ft4bqs/sitaxakijalosunises.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/vunevixesafugugezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=causes+of+political+conflicts+in+africa+pdfPDF 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 10744 bytes
SHA-256: b26b37fe2b802f7de8c0092236e826711576a26d5afbf3f57f613e412a214bde
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 17352 bytes
SHA-256: 7263870de8245df1b5335b9d31cf15bc83db3bced89fae71397ed0b74fd6d187

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