Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d8d29c5bdd7cff…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 00:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bda594e6216ff567962c7d05c2209432 SHA-1: 3524fe5d3bd0a695c86eb7ad75d7e078810eb687 SHA-256: c9d8d29c5bdd7cff4c64f091d1447a418b86466b354a967cb45f1c96a44d161f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://audit-advisers.com/userfiles/file/41252730113.pdf In PDF document text
    • http://saigonford3s.com/uploads/2021-09-13/images/files/15368417623.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sukelipev.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/rexevijenibo.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/wodesutopurapivaxawifapi.pdfIn PDF document text
    • https://alohasafaris.com/files/lonerupixuxoguxebixad.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/15504207296.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/tegigijudikelajodobo.pdfIn PDF document text
    • http://mlead.net/images/e/file/noxapolomag.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/tedurexozuxazatumekovit.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613da59530ae8---vilowobuzij.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jewananamefepefelulavosi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41e2cfb57---zijegirazemekevobi.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/kedaxa.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/gazulamenipajomavo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/luruvemovobaronito.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/jutuwexegiv.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/87999748879.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/wadarizumularuragupam.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/roturokimeluzu.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/xamasoro.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5f6b7c0e3789006abb85cf4741ed192a/vofoduz.pdfIn PDF document text
    • http://potlista.com/file/files/2812218058.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/89297007484.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/dimuva.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zirasuseke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mulan+2020+gostreamPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 10696 bytes
SHA-256: ca7d0dbe5b7a8fdb41a925832f3ca3780cd62c88018aa6db36c03b8c5ab2702e
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 17628 bytes
SHA-256: 54d80f17272a4d15f132e87cd83a2f0ca80ddf1b8bbf72d13efefe3d91563e0f

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