Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7d2baf51c91ee0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 19:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 657d0f0464ab3ed4f1bdb0f92baa0569 SHA-1: 59c8d018a3fb0f1c8b458eaa0dc95f617ac50e84 SHA-256: fc7d2baf51c91ee0a2c2e0535ce1c08f52c2eac29d5061a7fec5833f05d554a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, with multiple URLs pointing to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8739

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba31e6f86---sunenuxewuboposuzil.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1b2ee8678f230dbc10cbe9af8d6c7bf/pegarizupo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7370c0415f---xefomopusujadasonoxilogit.pdfIn PDF document text
    • http://contactconfiance.com/files/files/leraje.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xipije.pdfIn PDF document text
    • https://senfina.top/uploads/files/rerumuvaga.pdfIn PDF document text
    • https://steammining.com/userfiles/file/83453637516.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d32b3adc---37555151511.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/noxajazewugasuvo.pdfIn PDF document text
    • http://ave-france.com/pics/files/firimonobilebigijol.pdfIn PDF document text
    • https://hoavily.com/uploads/files/88241165510.pdfIn PDF document text
    • http://fullx.net/files/kolavolef.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/38582fb2c3dbeaf285915a3d0cc0c974/62067099490.pdfIn PDF document text
    • http://dolphindp.com/kor/FileData/ckfinder/files/20210618_1CAEDEFF888E3B09.pdfIn PDF document text
    • http://classtool.info/upload/files/bosilubovape.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/76689050018.pdfIn PDF document text
    • http://lamay.de/userfiles/file/42912702190.pdfIn PDF document text
    • https://tekmaker.com/upload/files/70350797211.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gmpviucd5ftv1v3nditv4h62s0/21702900.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/96379186026.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/xurexa.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+defibrillation+guidelinesPDF 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_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 18468 bytes
SHA-256: a946c86183023811a37b22ea40c2109c51c538b65937698a96ec2c0520335a1c

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