Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef14b76b4b4af437…

MALICIOUS

PDF

116.6 KB Created: 2021-09-04 13:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b87622118857e8c084f530227a6c3cf SHA-1: df548b9812bd3f390dd08b0ff88f34c6276f0ead SHA-256: ef14b76b4b4af437221113804a5a2efc527b13aac85fc42dc289e71ab9c74c6c
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The file's structure and numerous external links indicate it's likely part of a phishing campaign, possibly delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7301

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://healingtown.org/userData/board/file/rawamegawuba.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b6e433f3d---84067393136.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/61730091385.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/fepusewo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94c4ce711---finaxe.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/bubareletunuri.pdfIn PDF document text
    • https://lavineriablend.it/file/mijizusuva.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/fotajaxugotifenebobarig.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162888133055.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/63053168152.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7eedac16a5d48a39c675b16bda03cd7a/28217355344.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/7397001704.pdfIn PDF document text
    • https://webhosting4.net/media/file/50792471651.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c886e1745c---dazuzafuxefo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3442ab09---fumatikuxij.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8509643e89---widaresu.pdfIn PDF document text
    • http://onlinevay.com/upload/files/puxesujigulu.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/12004910175.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jakenosujuxik.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gegop.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6174aaa3bb---sapuvalitulop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=locksley+hall+poem+pdf+downloadPDF 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_off0001aa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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