Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcc894e27d12dd5…

MALICIOUS

PDF

78.1 KB Created: 2021-07-09 12:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 96280f56b3e434cf4cb868d96198143d SHA-1: 2669f8a8c0ac7078dd3560425bea21705dfa196a SHA-256: 3dcc894e27d12dd54dcb5ac899da36c3a39f01301d803d2df556691c081038e8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4578

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 https://businessservicesuk.com/userfiles/file/78536843177.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a6daf5d5---rojanujujipaxagi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f296e2b72098ba1f1e58e32fe80c345c/sovikikesowelutebije.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/60212106612.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776044d8cc1---xorefuz.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/3304842912.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/lexenififuseg.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xoripanadukosa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085852c6260a---50427517587.pdfIn PDF document text
    • http://fedime.org/imagenes/35911034116.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/tukelevutali.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1ea0757dcff232faa578e150a1919c2/74285149294.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/7763f05bedc0b99d2b1323f15404fe8f/mulebomipazevosus.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a4a4fe4dbd41b42beb44d9df8d6f4d97/runedorubozovakex.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d410c5284b13902215492fd573bd72b/ribux.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jupoxukenesoxisagufutida.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1945577ae2f2a117b6b410b42d8f9e0f/dilupaxolon.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ian4qeidopbrp0qk6o8chr3307/1140536597.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609995940fe37---38262693769.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4acbd97772cc09d1d31fffc6b3137722/redubopabexobojadukiva.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/65713217792.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u7v8ldjlrgq43jfh8033r6tv1n/94832961004.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/eac54ea7bd5ee8187d335f0fda3367c6/62244257361.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ecd9883317c20eb55bb5097d527e02e7/kitipojaxogiw.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/baxeribasupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+know+if+a+function+is+an+inversePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17452 bytes
SHA-256: 5bf530564b276d514e9e7a97c6ba08fe5788619188d75ecbb4db9811f40ca366
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 10616 bytes
SHA-256: 0ef1002e06c38fdf9dc779ddebe661de30bd8db0d2a2585fabc814fe43d0b9a8