Malicious PDF — malware analysis report

Static analysis result for SHA-256 873d734de0607ebe…

MALICIOUS

PDF

51.2 KB Created: 2021-09-07 10:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f377ea3d55f400def5187546fdb1c0d2 SHA-1: 77e292221990f05ecce31e6c11a4a0bd883db26e SHA-256: 873d734de0607ebe225e352a130fffc48e64bcfb6225ae913dd24e4b5b604dd1
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6843

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=upcoming+bank+exams+2019+full+list+pdf PDF link annotation
    • http://hysansam.com/fckeditor/userfiles/image/39577071466.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/tekokaxovavowigetumagi.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/takinubavinopabubibumawuv.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/83957cf52587f17e34e53db3705be733/33897867481.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/lizafujitivoxebu.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109030255432334.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ff90d912bb236e5f0d4e94f85af2a963/49300977480.pdfIn PDF document text
    • https://digireg.se/upload/bisabugaguwokovikudin.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/58255193481.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/poteludulovuzopomonopog.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9034bb169c---59256408126.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jovemesegerebil.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/32546836261.pdfIn PDF document text
    • http://veitali.com/upload/files/mididerukogiba.pdfIn PDF document text
    • http://sayarbobinaj.com/file/pixitanefubowinupof.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9a2bb344---24344422389.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3766f287---verojejogozozajagisipa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb75ea378c---dajuzasuxosudizudir.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c8505c5433e11215b15e3e61e3d05b25/perajaxovupuxolamu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5iohulgnvnp35215ncf1h2k450/74620174758.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/42855017254.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0399e0811---witokafipevepibosikusuvib.pdfIn PDF document text

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