Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b3920f411908e4…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 08:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad3003d92a6a401b6dd4fb5c6a8561b5 SHA-1: 85328c564d30e6a94bc7aed788a43dcce5154826 SHA-256: c9b3920f411908e413bdc6f64e55f3133325a817a4a925bdfa6ad64f9c92cbba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to 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 for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests the document is designed to execute code, potentially to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://iqrainternationalschool.org/_assets/files/49809278445.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/lesibetifuj.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/17444868073.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905105952973786.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/80142815283.pdfIn PDF document text
    • http://grupophi.es/uploads/files/bijik.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/megovasorijigo.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/13667780699.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patulo.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/7025873858.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/54087821648.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/55521150724.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/82265869103.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf36c4a43e---sovitunemawevet.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f95b1c739---totamafogerafuzub.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/16023566877.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8f0078e6---xekenutaj.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/supesowagiwirun.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/sazerifewekexininemo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/36931218001.pdfIn PDF document text
    • http://ruihuitax.com/files/file/10973970990.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/57936138629.pdfIn PDF document text
    • https://stopserv.ru/files/file/bekepawonamebap.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/lefamumag.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/joropinimuvofibekagip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=guitar+hero+apk+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 10384 bytes
SHA-256: a2bcbe7d48f70b8a2dab8a2dee878406ab41568f68febd4cacfa8a6c8ea80806
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 18588 bytes
SHA-256: d874c5a0bbf6859634dd367a2c5a3a2cee71afce2317cc8925635e8877f81fab