Malicious PDF — malware analysis report

Static analysis result for SHA-256 67901f6edac786bd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 16:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7aca3a63ffd7948451ddb2f987d84784 SHA-1: 2b91bcf029ed97303f0de71a283c736f9b766cf3 SHA-256: 67901f6edac786bda034ca4331850e8cf159d67340d876ce52a49f153ed4f16c
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and the nature of the hosting point towards an attempt to exploit user trust by directing them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

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://vdadanang.vn/app/webroot/assets/files/beguvana.pdf In PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/sosomewone.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/77364416628.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kebatulezive.pdfIn PDF document text
    • http://attlas.center/userfiles/file/babafalugukorositedigor.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/32435088108.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/43998782923.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/lewezinu.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1ujld6tgr26um62bmpaqor0v1c/bifiwolobitatemezitasape.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/42148817892.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/foraxijefiduditube.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210805031454.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/89007001594.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/debifenimuperaliwujuluwis.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aaaa6cad5---45677069898.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/i9e40bb283196qm08i42mricf7/fagutomodosusinonijuze.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0bf24ff2---62339595179.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/45a0a164934bf0a67d286e251eb1b518/65446746957.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8d518d8ab---43588479724.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4f7f3d1f15e9076f49721878884b32de/51031545562.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/282331242235.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/46824619285.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad9be443f---gunurewofijujonivopupupiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=skills+to+manage+angerPDF 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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 17800 bytes
SHA-256: 7bb06ef81f261bfe69c331a57616a06be8b0d5c8b8834cbbc35fa8d8dd417bb1

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