Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87b3b67644e0d79…

MALICIOUS

PDF

51.5 KB Created: 2021-09-25 05:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b495fba248f1a344649960843f2782a SHA-1: a9485d73c3f3cbea2661d4742178460dfc810939 SHA-256: b87b3b67644e0d79197b3defcdc064359d56086a0f14a06f791f05a68e3f3a91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Many of these URLs point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple links on non-clustered, disposable hosting further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5824

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 http://prime-standard.com/piceditor/file/nujukibafa.pdf In PDF document text
    • http://jonkmp.nl/img/cms/file/vunudubipinosikomozuf.pdfIn PDF document text
    • http://metabolit.ru/files/file/37997818865.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58527c32008b0b4ce13f06b9d2c9e1bd/paduxigadajutox.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373f0af143d---41643673275.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21221254612.pdfIn PDF document text
    • https://mar3ol.com/Files/files/rupokegonatirajewano.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/99856188216.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/67940891564.pdfIn PDF document text
    • http://hkacca.com/userfiles/tatikavorifini.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xuvedenufa.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/vodiduworotumelu.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/likiginaludivuwekeduxem.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tevilamopejesobaninaz.pdfIn PDF document text
    • http://wjcopy.com/upload/files/25783483730.pdfIn PDF document text
    • https://emenu.hu/editor_up/viraririnobom.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/25261913934.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/22582620593.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/13213259056.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/44365597871.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/fevotufuxijo.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/56389732887.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70e8691664bc258ab4598b1386dfebeb/pirovabuvifafo.pdfIn PDF document text
    • https://akconta.com/uploads/files/96597320428.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/xafukivasi.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/titebusebolejizigizun.pdfIn PDF document text
    • http://bienbao.net/uploads/files/basutonukojafonozagiji.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/sonimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=popcorn+time+for+android+apkPDF link annotation

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