Malicious PDF — malware analysis report

Static analysis result for SHA-256 545ced3fbac1f915…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de75cb487a329ffa89c8dd4d928bed2c SHA-1: eb5d55304f13fcd26b0aa58dd35cad00df715173 SHA-256: 545ced3fbac1f915228d1cfe7d3afd57a71fd3af6154a81f3fd0814413bc85e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8146

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://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/16385794044.pdf In PDF document text
    • https://tefen67.com/userfiles/files/66273792380.pdfIn PDF document text
    • http://beijingteye.com/upload/files/1500409899.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/62799622342.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/52992781881.pdfIn PDF document text
    • http://hodori247.com/uploads/files/16348011808.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/5617715578.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/42623314870.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/306798943.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/detoligibufikigu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/wawesopedajeze.pdfIn PDF document text
    • http://orderkai.com/uploads/files/vobagikuxowurute.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161415e50880e2---43337167311.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/17411027756.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/sovalibogegipo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/tebikopetegejus.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/42870965246.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/telenawetow.pdfIn PDF document text
    • http://epicridesnepal.com/files/sosodonada.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614655cfc7d54---1006182410.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcc0c5a2a---29402954855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+draw+a+cowPDF 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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 17032 bytes
SHA-256: f450809da4216bd9da7a7a254ea00d3d0284ad6c304b3da4fe4e7930d66b1d4c

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