Malicious PDF — malware analysis report

Static analysis result for SHA-256 810bb16cb9d7c9dd…

MALICIOUS

PDF

145.8 KB Created: 2021-07-26 01:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e775a649463d2334d791440ccdd9bec1 SHA-1: bd74d60549b6985d80b8bfdfae5b2e109fbcfb06 SHA-256: 810bb16cb9d7c9dd05378b16cf8e52e02d435a9f1c769b8e89ebad89831edc93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5323

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b195fff414d---wirut.pdf In PDF document text
    • https://juraganmonyet.com/contents//files/vosunuxufegamivevo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0294ae8ee---69556512716.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/nuvebajawamosujo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d84c9ca9---wagevone.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/25959351984.pdfIn PDF document text
    • http://boxethai38.comupload/file/kodaxuwivurenabuzolumor.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/35075729223.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/marunimumomurupokiduzepu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/767c47f596e337eee4f4457d98cfd62b/46173847251.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52907232368.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9289cac533---xexasolomimavasubadi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/93996676609.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/77867132815.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/26507567988.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lopujajilarasijobejuvoj.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/b8f57a6d263f12136075345431ccdf99/50675827413.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/zapivomixikaxurenerelovu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5f30ffc23e022c70f55d02ab5fca659e/71855996263.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/webawunoguk.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fab71a83f---31295109423.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/79141806316.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/xosamapatefidesowalajibos.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/c1dve14o0upditjc40m1adir10/57884918143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=thermodynamics+an+engineering+approach+cengelPDF 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_off00020b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2234A 10940 bytes
SHA-256: 1bf0577d4b582f475a24ad87e20a4d230f06c2120c70b5e754ca76653a365d83

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