Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fab91aab618a14…

MALICIOUS

PDF

62.5 KB Created: 2021-10-01 15:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 628da92bad2dfaf73b394722185aa7a8 SHA-1: d1772049b05a976a277412b63a6b26057a98d27f SHA-256: 93fab91aab618a144d4688315ad39b1debe0356fe26a8a8672fb9f4784106f53
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5369

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/c2e92n9qp44khnp2bddff98o52/muxinasozubazojeke.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b0ce2e29ffeba49b8dc056b7f367246c/vemoladok.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/parelaxogiselekigezog.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zaparurebidirowufirojuxeb.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/xajovujejapavudoxopire.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/wedugo.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/98750185229.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109290152428248.pdfIn PDF document text
    • http://vititanon.com/user_img/files/namilobedor.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/nojitibebefix.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5a2467f28a849d398bb258fc4317553e/ginegomalame.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd81171a41---nowibixu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/fuxilolidatuvafolixik.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/velopefera.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/44131444752.pdfIn PDF document text
    • http://355353.ru/userfiles/file/mimawaziteloli.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/35e7c3b61dc3d19aa0ae50e8daad703d/rogikub.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/86437324381.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/likomutoluxuwupa.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/99757048069.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/bagemefatuvuxawororofo.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/75993853106.pdfIn PDF document text
    • https://serka.com/serka/upload/files/fedugem.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/1745865675.pdfIn PDF document text
    • https://bliznacite.com/files/zexizasedowazinevur.pdfIn PDF document text
    • http://gaudi.tw/upload/files/tesilanuwifaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=logic+and+computer+design+fundamentals+5th+edition+solutions+pdfPDF 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_off0000b6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EA 17292 bytes
SHA-256: 9ec7b68e3c640d4171bef38b1bf8affa0a77d571d111bbb81f4d166f25284572
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 11256 bytes
SHA-256: 84b406628b4f72458292170998b8d52c41e80e88a1ac82d089bcc44a4daf1e5b