Malicious PDF — malware analysis report

Static analysis result for SHA-256 b259e64b30c516af…

MALICIOUS

PDF

101.4 KB Created: 2021-07-13 10:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fc3b5bbd06783914cf7a8ef17d4faef SHA-1: 497789fb9bc55196a2d839be4afd1446bd762afe SHA-256: b259e64b30c516afef474339a78f03cf4691a3d91d12fd95fdb75da1e26fabe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://telewebmarketing.com/FCKeditor/file/pulukepokozowixilodas.pdf In PDF document text
    • https://texigo.tw/upfile/files/2021/07/13/12087106124.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pvv9e02625f8qq72phgtqvrfof/juwotobajapegodilogir.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f175eb7117---fabadotil.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/sesijizorelosip.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/70c7138674d31cf427d7e73acb4ada1f/78376901654.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3bd1ea7dd4cda46bd0babac5f0d68ad9/ratupakazez.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/bea2a96fc9879ebe0179bab2f73569b8/guxawabopirarisafedijurex.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/togusevisedigulisa.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/92482185576.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/vopej.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/vuvowozukotagakava.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c3319011136c8e78e124f70159dd788/botanivarisaf.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bs7cc8ntumktv9cjobf7ae673o/85727329101.pdfIn PDF document text
    • https://carlojans.com/cms/file/ripatuxemewabuguposom.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/97mmdrq5rm17oav0logn92a4hf/37296453761.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/nofejerikimusow.pdfIn PDF document text
    • http://primaneighbors.com/userimages/59140630976.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/18149241690.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/3142129432.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/pokavopabamakib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=square+no+1+to+30PDF 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_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 18256 bytes
SHA-256: f6c4277a78ddd7fc84c1dbc6f94cac0ec9caffae4bcf2c6ac79e521ca13e8f8c
font_02_sfnt_off00016f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F88 10464 bytes
SHA-256: 3d1003acf94aeb8ab73df5292ddb562f4981605f326a666851eb2f2857d128a2

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