Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc2d07af1897300…

MALICIOUS

PDF

64.0 KB Created: 2021-09-02 01:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3fd7a5ec357d73b59344741c8c84f38 SHA-1: cabd9699a8f1186b407df83f85f3c2a9cb7b6e55 SHA-256: 3bc2d07af189730067771afaa4fd14c7b267a0c0d760dc97531ca4d6c9494225
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, some of which are hosted on CMS upload directories. The primary purpose appears to be directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9364

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://sjar-tech.com/uploadfile/file///2021070517004653.pdf In PDF document text
    • https://banghenails.com/upload/file/fopafotegifatewetali.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c2lq7ml27bfr9urhdqdmvm3m3i/vemike.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/juwosemozux.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e13ce581c---zifesukigovebuteba.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fivuj.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/76366764614.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a63bf9b7f2---mederozujag.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/97511097221.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/gomaretolabodowejine.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/18795470163.pdfIn PDF document text
    • http://ccsl.asia/files/24057607098.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/tomonapapizutuxatu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8bd0201b1---46252866626.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/13191126782.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/xobovijegemolupu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d3a1a5bd---17731947640.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/44377801868.pdfIn PDF document text
    • https://shibbirs.com/media/files/23587744019.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/tezewumifog.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a6302dc84---57464208288.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xupemipenunilakedotim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=we+know+the+way+mp3+song+free+downloadPDF 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_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 11308 bytes
SHA-256: 3420dc6ce5b21e15948305263168b91b64c98c63a6bb5842943170f266af3579

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