Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef1c7cd7b836e19…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 21:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d05e5cccb4693c8ac7244963636a04a SHA-1: dcec55893dd59d265ad486581556f8d04f903ddb SHA-256: fef1c7cd7b836e191625aaca99d27820bb57fec49618574d511f7695575dab36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable binary data, indicating it is not intended for direct user interaction but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://hubbardfamilycircle.com/clients/62940/File/badiborijovepetabafufet.pdf In PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/sagos.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1ad7ce3b---pujotedurozufa.pdfIn PDF document text
    • http://renovator.cz/files/file/mejivexowifudilekokavoso.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607907d20a5f0---lumowala.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e146d3c69---86910188363.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/91247119525.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dfb5caae0---pamafutu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/27895390973.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/juvuwepazi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf6516e87---36521565090.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210715_461D82C6617C8131.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sutijemefokagog.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/32973017051.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/zaxuxa.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/84734748127.pdfIn PDF document text
    • http://scro.ru/pic/file/10858947682.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b23e78e9f---wedimipawawomase.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b47d5405---sedoxibamafarawo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24323d5326---97885119670.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/towonofawedokolefej.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/xopuxe.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88210745396.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8093b13ec---38066146209.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/defivux.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/razefunafaperumumukijir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=growth+and+development+of+preschoolers+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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10984 bytes
SHA-256: 1fd02c2a4006d7f2fb47f0b34e74bf8702433dfa5558cd4e7a8de9e332c6d7d9
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 16676 bytes
SHA-256: 039de15999415a07afad5cd79d47742143fbf53db5976a125100094e1f946332

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