Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38d8022cd49656a…

MALICIOUS

PDF

54.0 KB Created: 2021-10-02 11:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d17923c18e319ffc3836f7ee7ef0342d SHA-1: da0efdd1acb4572d6dc46540a95631e1359c5d0e SHA-256: a38d8022cd49656a568d6c223ca575efc398cded1879fe45628e2ba64f7b4e98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to distribute malicious content or phish for information via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8114

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://madonnina.info/userfiles/files/wajamatekikoxowefegebexum.pdf In PDF document text
    • http://stmarysharipad.com/userfiles/file/wegawovini.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/tifanibopen.pdfIn PDF document text
    • https://umartravel.com/files/74979812778.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210918_123027_200.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/96e38b6dbb22731e4a73e79ac013d655/xowobovip.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sifijukixe.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/bulukurubawoveza.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/navire.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/72945710417.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/rodavuditixugoxinu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f26f48c6d---30080721571.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/pefusapina.pdfIn PDF document text
    • https://upaspor.com/resimler/files/waxugo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pq2uuilaqaldpgve7v17e8je0j/zinikoxagubukuzinipe.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/vibijesusapitu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/miliwedutezewivawerojom.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520ee1d9728---85425339014.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/kuxumenenotivowa.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/labipabum.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/wajaxesedukuxowu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/woronakebewenu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ffmnvdiiik6thktpmssljsrrel/pixupinuborazumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cool+house+plans+minecraftPDF 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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 10876 bytes
SHA-256: 72ff7cbbec96b0a549dd815969c688132f439c1473578e2f7b62a5c654ec29b9

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