Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64937ca394885e4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 10:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ba10799e1cbb9bda1185e2193e39eae SHA-1: 580fd1e5380d391c1f3270d452ab4d9f1d0b112b SHA-256: d64937ca394885e438949647a5f2bd2f270cd4f74d8a1d891c23439055aabbe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and functions as a link farm, directing users to numerous external URLs. Several of these URLs point to compromised WordPress sites or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://adlinefor.com/home/webagen/public_html/korn/data/file/97402767467.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0d951ac8---37246481696.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/motoxuvajuwewowovofaw.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c67a42dcf---5065955883.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c116ab43---fufavexefumerutikupexaza.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/58426872698.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hrk3j2lpv7t3gnlrccdvosgdl1/nibudinoluzifo.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/kedudenagado.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pirimukakarowufero.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fce9cab95be---jekexe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811ec02fc85---mumupanidebivuluguxir.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/020d09bff8a043153a22d99e02bbde95/2998622136.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e3737246---taduseropivo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/91cf1b20f69761f0301764c3ca5a24bf/dejejugejabij.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/37d642d12129e7968df5a3e4741ee8e6/pujopujusuwe.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/venijinipapekinemoda.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/16742850318.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/44548992648.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///jikasegipikoliwege.pdfIn PDF document text
    • https://hssanesteban.cl/files/vipisebeka.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/kowemakigiwovujuratetu.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/79612838104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=heidolph+mr+hei-tec+pdfPDF 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_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 19232 bytes
SHA-256: e95d26f7b30d048ec6e991d00cacf974de6b1dc430d9e8a7048fb6a6524a0151
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 10476 bytes
SHA-256: 63b57299926a9d5fd5fac219b4bd633f96140b6ddb317509a2e3e983569eea67

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