Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c502812d4bbc69…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 10:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4238efee5b87f76cba13a90a02d7e555 SHA-1: 835d4ba7cf2696d56468b19d55788e0a1b8845d1 SHA-256: c0c502812d4bbc6901c2803b91fd4049791ac0c6f4c0f3960123077383146ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of compromised domains and the PDF structure itself are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 https://wastran.ru/uplcv?utm_term=god+speaking+through+numbers+333 PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf808e4f3---saxoselatujemovov.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/31f9eb9aff12922582492974efb402ae/tekivabofav.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/9388028329.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/973db716c2a0a4c2dc26e9a8a679f5f1/gixavijifumebev.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/6639989347.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/33716141537.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/gufaveridox.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ddb9ad757---dizomedabasafipu.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/viditugetuxid.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/pujejaxoramap.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/11672665828.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xafesegutubitofa.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846fa65741a---kagowoz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612991054b330---24268350834.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/gosaniju.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/29355567283.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/81295824423.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070278a3e65d---89769495287.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5e2c3fd37cac44203715262ff8c30494/47551803615.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc8d65ac5---29263310229.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/kokebisevuzas.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160918396243ba---32694792031.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/baef9d75130ae8a6b47b3edf60c63450/dexudujazuna.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/fozoxowuwadotet.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b167b69825b---kijosinifaxeruwewutu.pdfIn PDF document text
    • 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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 17500 bytes
SHA-256: f8344e196c99eec67b348cca58b29858fc03ead1e522b9bf306fcf140662c434
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 11336 bytes
SHA-256: 96126cd22ffc815cfed416cabe134268e46424ea18ab82a101b49e24488e9187

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