Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aa47eb3be46300…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 08:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc37cbf199c924762217afed66c080fd SHA-1: e7c379de486a6895f594f8b4da9bb916458b62ac SHA-256: 41aa47eb3be46300e1f97ce03554c58eb95fb34c998ceb352a791a855f0bb692
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5272

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 http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b26ca83db---23643539.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kthhore2c2enft0mgicatf8sl7/82064368317.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210607164608.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bbp04cipd74u3rssbc6lq4he4/62191042244.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb39718124---16422264102.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/puvowosomipexufus.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a54cb811---jisubonorikivavubik.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nr47r2ruv4j923cpf3b8i9k20r/begenukal.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/suvaxofuximedur.pdfIn PDF document text
    • http://machnik.net/ckfinder/userfiles/files/vazisiwubuguneminavedon.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/tomakelojinase.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/mizodekam.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/mozivuwerajeloramigagelo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/489fd57ea0057ca13793a9f6e2a9ef6e/36315462099.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/30472666770.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/51765208889.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3f3f28a51666e57c9f314ca0987a9abe/64984061089.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210518121232.pdfIn PDF document text
    • https://norservis.cz/files/files/xiloritonipafeto.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3b840136---vipugobo.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/54245233425.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/zaropotojibamabufexap.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/df5085d2bbec5caa8643e224b80cbd46/notixad.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c0k60017vhoctii2k3i1pqc1ik/71823761542.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801d3608c7---39954864823.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/27064463033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=esic+udc+skill+test+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 17400 bytes
SHA-256: 6ad0b377719dac041cbb87cb442a78b3a4f6b48ace3ddb86f788c0c9001bba0b