Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d3e97be981d32e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 17:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2eb07e974ab5f6b2a580504c711aa54 SHA-1: 03c977dc445f2860fcbc74e4e5fe027523031ca4 SHA-256: b0d3e97be981d32e8ef67ac67dd169394934c3e8b16a8dee4d7c34b09e3897e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external malicious or compromised sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.thunderesp.com/ckfinder/ckfinder.htmlfiles/24679736418.pdf
    • http://vvk-wiedermann.at/userfiles/file/40795754381.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/riwoxopavulovakagu.pdf
    • http://ladyvenus.it/userfiles/files/susalusepigudewugasuna.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/gosanomarabokivevuladivir.pdf
    • http://csc-0411.com/userfiles/file/20210902053354_doojrz.pdf
    • https://joebalogh.ro/imagini_ws/rimawusakewekila.pdf
    • https://rajnnuhiddje.se/userfiles/file/pepifotosefufarof.pdf
    • http://decorstore.eu/upload/file/47314146027.pdf
    • http://zdrowejaja.com/Upload/file/79658683434.pdf
    • http://peknanevesta.sk/media/file/77106363245.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614baa8ed2aaf---56311213874.pdf
    • https://greenlakecruises.com/ckfinder/userfiles/files/raxudofotiguterowopofiw.pdf
    • https://yoimart.com/upload/file/20210904014550.pdf
    • https://easypayindia.in/userfiles/file/patimugokozedemiro.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd41578632---vojop.pdf
    • http://stphilomenaonline.org/userfiles/file/71988702297.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9f06f938---55557492171.pdf
    • http://caytrong.vn/Images_upload/files/morom.pdf
    • http://czernavendeghaz.hu/admin1/file/xisedux.pdf
    • http://dhf-china.com/d/files/73638988639.pdf
    • https://aordonez.com/images/contenidos/files/lilozejaxuxutogamaloxa.pdf
    • https://mattress-leader.com/media/16573444806.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/53295891404.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=telecharger+the+king+of+fighters+97+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afac.bin
bf97cce7c1fe498f206eb23973ffcf11f91705a86f137039fc4471ca79d7411f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 15980 bytes
font_01_sfnt_off0000d83c.bin
9e006e01dc7bf0ca0ffcee4c88ef1d2f41efcf9fc7f7d67885ad1ec6df9716f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 11028 bytes
font_02_sfnt_off0000f1c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 16792 bytes