Malicious PDF — malware analysis report

Static analysis result for SHA-256 4651b94c862b8c27…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 16:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5edb479395f824973efe94b730c07b1e SHA-1: 4cad7557c6951215517b5a4a8f21c72ae6a033a4 SHA-256: 4651b94c862b8c27d75d89a10a13d2655afd63bc3a599e95fbdb605ec9678190
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as a phishing trojan by ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://digireg.it/upload/fujegik.pdf In PDF document text
    • https://purefeeling8.com/data/file/55664005203.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/84160926357.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/23147860620.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9a9f22394b40ce00f3f825b21a86ea8b/84931334351.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/sugisivagexifavenubaxu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611188d091b16---81427372117.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160823a6c49877---23390175144.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/pomowarebunejegabal.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/3dac14d825c53cb99a4c2d843f143da0/sekexadalawejavesefo.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/30522779853.pdfIn PDF document text
    • https://webmenuplus.com/images/file/34443166015.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/699918446.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/25a0e6bd12475d050011a84f9d02ba0b/vuzejuvusetigiwezukuvi.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/72777168506.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/97f79c77922e63a4bd3b83d608694aef/kujemimupawojesidol.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/20ac076c08e8145c0c02a64d2c4e02a9/tagarixade.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/30418024010.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/47644159385.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/68011597180.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/fotobabom.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609894a7bec9c---wupenusamubanazarubiza.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/mupuwapotonofedevuwad.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ed0cdf237f03d7ed9e5ee7b501ddc9ff/34000607264.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/dovitajoxu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/99a9c081213b255467251df06900f968/pedetikenunibudogovup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ocean+digital+internet+radio+wr828f+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 11192 bytes
SHA-256: b60a88289134da86984840bd2796182430609db1b7057aa852833fc24baa4347
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 21756 bytes
SHA-256: ba0df37cff190b65e21987e9a73ca51517f274a0af5e56b2c91f8d59ac00166e