Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bd7626601389e0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 11:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 307ba980f73e7065048831a8d82d27ac SHA-1: 809bd866afcd36c21cb4d43de4255cffcd9814a0 SHA-256: 39bd7626601389e0f0870390540ef9868c39a72a749a67cff1467318eba26334
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point to an attempt to exploit user trust via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7145

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://hzjksj.com/images/upload/File/94706996517.pdf In PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fegugigomepekafad.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/45537028564.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/87464341230.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/62045769290.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/20205670059.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/76808026457.pdfIn PDF document text
    • http://888chji.com/userfiles/files/5318179434.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/65688411206.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/h6d8hi4049r5nf2nbqqtudgb7e/5828364793.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/logujejilevurigiru.pdfIn PDF document text
    • https://istanajp.com/contents/files/mitatexasezesefu.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/30601883135.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378975de55d---22744672432.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/gabowegokajupiromu.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/40306495511.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/4225819081.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/79172846212.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jixelejixan.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/jedezurevokuvubaj.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/3769553488.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/worurawi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuhinm0cl6qtucki2p97com7oe/82785008133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dream+league+soccer+2022+downloadPDF link annotation
    • 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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 10952 bytes
SHA-256: 0def8a931d67b9338047f02119080ba9682af6555499e016d5da3c7a9072ef95
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 18720 bytes
SHA-256: 5ec7fc0a13952e8ab6b600377acdcfbcd7c250a3e193c3c0a27a318143b2fb66