Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17633212c139272…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e87b1e9c54c7e9ab73f92664f1096cb1 SHA-1: 1bf0080112e4b8d46fe6f54b8ecf649b226ec79a SHA-256: c17633212c1392725a67738351176e0964ab1034b24f625d5657b0e462e4ea2a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to potentially compromised websites, including those hosted on compromised CMS upload storage and disposable domains. The primary goal appears to be directing users to malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jshtextile.com/UserFiles/file///doxakazebebebato.pdf In PDF document text
    • https://groupekineconcept.com/userfiles/file/rorenesuxefabofabixaxes.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/wirojewodowugema.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-02-23-05-03-41.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378889f3baf---solijamuduzosi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7d3e8881---lifefivasafepedode.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/rumesitu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aa33c8a3---tinaduluze.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/42487549076.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mitinemawej.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/bevuzijerofexozofawipuv.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/66749944578.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/junoluditoxagefom.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/85004719228.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a39q0c367bvcs61va7t6iau7ed/mopisilebezowezumarepo.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210909015549.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/bodumixufotube.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906033650853875.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bafogavoviwolij.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/daruwirabagisabobupepilet.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wanigaxowaluvevizejipojo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161361121f1ed6---tesavagesunoteronovo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/11169990805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tennis+live+stream+onlinePDF 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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 18564 bytes
SHA-256: 5bf90c456565157fd7ba8d2f4f82245f2b97b280ecdd86ba65dee390360bea44
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10300 bytes
SHA-256: a7042150538a4416d3b971b0230f9a06f7df5e7cb6e3f0e12acb7390668e1e3a
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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