Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4df23aa64d8345…

MALICIOUS

PDF

85.6 KB Created: 2021-10-21 00:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a3499ded86eb9b47c33a3977ea09680 SHA-1: 1b382eaf059db72dddcfc7cc51e48b2e973f746f SHA-256: 8d4df23aa64d8345e813d3c8c56202a6d93518223124ab932c2880f68161cbc5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an intent to redirect users to potentially harmful content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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 https://websbag.com/uploads/files/novoluvavijinonalonomewaw.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/99033595325.pdf
    • http://rc-modeller.se/images/file///30238121496.pdf
    • http://medicamarsala.it/userfiles/files/53245958597.pdf
    • https://longhoang.vn/upload/files/70971254400.pdf
    • http://huyminhplastic.com/upload/files/90512065765.pdf
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/61261864922.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16160d1dcf2b72---dukujulojodatexara.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16168a94b1c792---zafepuzunesivexi.pdf
    • http://fine-trading-knotwork.de/uploads/media/63291989446.pdf
    • https://ka-base.no/images_content/file/64414820813.pdf
    • https://heritran.vn/uploads/news_file/wotozule.pdf
    • https://ulsantour.com/FileData/ckfinder/files/20211001_C08BC1E8F5A7E9E5.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0ibgfp8rc9oc31nsjk4vcq453t/paxuke.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16150bf887562f---sijawar.pdf
    • https://ourlady-schools2.com/userfiles/files/95735698569.pdf
    • https://cvzona.lt/resources/img/files/xawisatazaf.pdf
    • https://shellserva.nl/docs/Image/file/radufamizodaw.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/82724284719.pdf
    • https://arteziano.ru/ckfinder/userfiles/files/56721351091.pdf
    • https://appchecar.com/ckfinder/userfiles/files/rizabixon.pdf
    • http://aeon-dev.com/uploads/files/202109281326009156.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=i+wanna+wish+you+a+merry+christmas+chords
    • 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_off0000e53d.bin
b823d9c4db06115d9cf76c1b76e2fcf0050a32551478b484b90521fcff633d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 19100 bytes
font_01_sfnt_off000117a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 16792 bytes
font_02_sfnt_off00012fc0.bin
174751786d4e751829feffd547271f089df72edcf3def1aeb53b42c2b33f903d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 10840 bytes

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