Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f556d30fa31c2c…

MALICIOUS

PDF

53.8 KB Created: 2021-07-20 00:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66e8304c5e1f1d9327ce499a23a88b8a SHA-1: 0263dd56d2da08edb4fde582878363c90819fc5f SHA-256: a8f556d30fa31c2cac1ca98cb6d2fd2e2966668c5d844102a352903cefd672ad
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, hosting numerous URLs that point to compromised WordPress installations and other potentially malicious sites. The PDF structure and embedded URLs suggest an attempt to direct users to external resources, likely for phishing or malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4912

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 https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2608b40ac72264dcd65673d56f396790/wubiwasuzipu.pdf In PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2ec45c7e0eafeaf23b61cb80ec1e890a/8970454896.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/447f9bd53f91e3eb53735d7330e8ce0d/wepubijarivowul.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zugag.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb25448ba---lasuduluwuraverafaza.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c101a95307c759fa28a3f185cf16dd7e/84578537165.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0e628bb6524cd505207ed4ba7ec09815/31800941316.pdfIn PDF document text
    • http://technocom.pl/editor/file/fogoxeresogemez.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0c174767185b89f60056a655790cc471/90484304795.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8d20af1d---84678849902.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3dddfc8d015cdbab797d3f44fdf6195/zosudod.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/jerotozefe.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/72704229166.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/bewuz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/53414a5955947eef2b731f42de684b37/tekufozejowedetijovevusam.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/81689993829.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cf1d081d---narivibutapa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zovedazi.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/80407339003.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/kimogow.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faab12e32---ganeruxobunawemubuvo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174570b3d2---kiroxanoxew.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f961a5cd41---35438603623.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2f6d6dac279deb8085ca36e8ebbcd9e6/fopikulegaki.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/513d5b013c8cf93a94ebbc6befff885b/20460522266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vocabulary+workshop+level+a+unit+8+completing+the+sentencePDF link annotation

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