Malicious PDF — malware analysis report

Static analysis result for SHA-256 23badb7f0bff5266…

MALICIOUS

PDF

64.9 KB Created: 2021-09-24 05:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af3373a2d410b70ae99dc1ba6f7929dd SHA-1: 12983031a8cf802c6911456a253e3c0d9704b3bd SHA-256: 23badb7f0bff5266955f8e3926e2327e2123f27da7ad14922f75837e2b4e5c35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8306

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://automyjka.pl/automyjka.pl/userfiles/file/62612833980.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/83435763376.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9ff9f13f1---xevuwobized.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5g28dif587mrgvv1iv0s9mv07/92394170037.pdfIn PDF document text
    • http://seamacros.com/upload/file/wizubibopetid.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/17191114102.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/revitogugojan.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/13701629722.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/76518100111.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/lidije.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/9484559410.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xosowowaritetekafomomete.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/9958218977.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382abf916fe---misuzafubadukojolojopa.pdfIn PDF document text
    • https://yasacompany.com/upload/files/muzebotunijoguvutibububo.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kimororejozinurenikiponu.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fewelipozifepawovef.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8348ddbbe---17416852103.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/87966788679.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/88024142709.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/76175180542.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/49885521153.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210912103416_1300205742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mirror+screen+to+android+autoPDF 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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 17144 bytes
SHA-256: ea66474c84422b58a2bb74177a6c9bb0898a09cba1a364c955c6451dbfcdace6

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