Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ef53fc3e0dfebe…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 03:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e7f06a24373e614dd1c5314b442cb33 SHA-1: 42bbea02ec7e26efbce7c065928b5e44a6c55df9 SHA-256: 26ef53fc3e0dfebe49dade53cae2843ed12ed366607f27e8d61ada6b0e66b842
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be386a63a8a---batekisa.pdf In PDF document text
    • http://arch-teh.com/pic/userfile/jibosagi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2e9eb6bc9---puruvige.pdfIn PDF document text
    • http://schubert-hh.de/image/file/dabodupanizefaki.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/62896902380.pdfIn PDF document text
    • http://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/jexupikor.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/6287273039.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e29d68d40819e3310d10b2b589cf0a34/newubojamamo.pdfIn PDF document text
    • http://synowka.pl/galeria/file/xuwogejilenilone.pdfIn PDF document text
    • https://lemanssrl.it/file/96145095345.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91462e1c87c2ffcf5f9ad514882c210f/todopabe.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kotozagatimokujuja.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/79429871963.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/lijus.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nasobixabamijab.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/jilepifesigogelewulajoxi.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/tazonererubila.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/52549236160.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9160d4aa07b9928e6b51053f640b45d6/wibowef.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/436c4e18a617ee182686595d29bfce1a/vegukaguvuvuzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=partner+falling+out+of+love+with+mePDF 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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10748 bytes
SHA-256: 660a13c16c509e1863a222874c84930167dae14da2a2cedbf1711d76dbd96293

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