Malicious PDF — malware analysis report

Static analysis result for SHA-256 508dfddedb15bb66…

MALICIOUS

PDF

88.8 KB Created: 2021-10-11 06:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c103068b2f1c8a52c9a415d986fbfadd SHA-1: acefd52cc8f0740fb92848a6f04ae8efcbaa437a SHA-256: 508dfddedb15bb6690a96a5af9e2a259dd94f909d72eec0ddda044a9d685e8d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=can+you+plug+in+a+power+strip+to+an+extension+cord PDF link annotation
    • http://kondicionery-shodnya.ru/upload_picture/file/45810466906.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/8278263535.pdfIn PDF document text
    • https://ebooksweb.net/files/file/47280959812.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3d4e3b27---lisekegunilidegomes.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/98984656068.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/87109629333.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/nanorarinigixotodarafivo.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/kanevuzepifavefuwumulub.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/28475923832.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/39198933322.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/mupunodalagiraxuradikozif.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/1048178295.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/nabasazukadodevosunazeju.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4d33f71d1b24db6634a96b60e71c7461/56713236939.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/69380130127.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b537dc12c---piwujixojusobaxofenojev.pdfIn PDF document text
    • https://ckmandarin.com/uploads/rogoradonufe.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/12335505156.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/gumof.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/51098976416.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/10779147615.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/jepisadelakonebidakug.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/numoruw.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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 18868 bytes
SHA-256: 2a484698d36bb0a0c0e0cf0caf51e4414043b6851af4488ab35bbf74f846c06c
font_01_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 11124 bytes
SHA-256: 04741d42ec30889b6c90665fb034da798b958b6af565f5bcde176fb8884b7e2d

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