Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09d35ce69d58c2c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 00:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd75386aae191231f7e1abfe4148e966 SHA-1: d2deca2cfb0937651e42ea9b6186ed52436bd677 SHA-256: b09d35ce69d58c2c6dff2d049745c3c99c0602378c35037de760c72f6d7688bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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 http://www.civilhospitalpalampur.in/img/uploads/files/tubisujewonuru.pdf In PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/28381529239.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/mudirexosifiwabap.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210713125029.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fapofa.pdfIn PDF document text
    • http://technocom.pl/editor/file/1946878987.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a48f6846f---nidinizapufa.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jiligakeruwitemo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737f1f39ea6---bilero.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wirubi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/87887340815.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/rewiwot.pdfIn PDF document text
    • https://drlanda.hu/user/file/jijisibifus.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/30031955349.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/33329220423.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kn1hj4ue751t1b1dnd0hbgqd03/81108533722.pdfIn PDF document text
    • http://jsdarvin.com/files/3294214804.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/siwenofalagorubidagimame.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/35428406928.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vedalufewomesigim.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086507a01b9d---tevatasodipajuku.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/35024996469.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbed9c15b---vazopilixo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608755ab18c07---refoxunutubani.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160750e033f0db---99782086005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=orwell+1984+pdf+deutschPDF 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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10956 bytes
SHA-256: f633105f7e272593cd159a60a07e5e80c8b234bb32c5c08d166cc0e3170ab2e6
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 18772 bytes
SHA-256: e72df3cbdc73a217fc90c9dd5948ff7b5ee61952de73ab9235495387af23834a

Open this report in the interactive analyzer, or submit your own file for analysis.