Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c6119d979a2131…

MALICIOUS

PDF

94.2 KB Created: 2021-07-14 09:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fa53dade9de03d6e30615660acf2c9f SHA-1: 41c2f04881c4e635fcf420db50e7ec956649290b SHA-256: 21c6119d979a2131f18136a3a6c513890a7be636770a4a54d26f1354ba7bd6a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm on disposable hosting further supports its use in distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e11ac5d25---91360506829.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e412a24ee91---89718304479.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/63708861122.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca4262b79---gobamexamizazuluxofa.pdf
    • http://arohitourandtravels.com/userfiles/file/72096349772.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/u3jj7csif9kgrn518gkjt4bk7e/lerebebezusanetivasoduzit.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e22496d3---76368191245.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/588868e589bde20e4fc9a9ebd5af711f/71110070762.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093ada47ea5b---vapuzo.pdf
    • http://valsadindustries.com/userfiles/file/nenififer.pdf
    • http://cdmatik.com/uploads/file/59797499661.pdf
    • http://www.contal-farmer.com/uploads/files/ruduvavile.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6df61084bc9444255a8e94d25a007f99/56700598653.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/cv45mvdgp0eidea58jbud4bkjr/39470947041.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/6411611269.pdf
    • https://makenie.com/upload/files/xafokidadekowi.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e235041c7b8ba08d44d5f2ff1b548705/jefuxow.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf38eac836---bilenararojazatatafum.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a7b5eb28---13238726857.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/353914b278e3809e70116daf7939dc6c/21487201228.pdf
    • https://giverny-bkk.com/upload/files/83316611251.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a70a72935---64951780339.pdf
    • http://metabolit-plus.ru/files/file/waxekidevileluj.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e943fb3fe3c---jezebawotubena.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=puppy+shaking+head+and+scratching+ears
    • 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_off00010c97.bin
100baf557508ffa6450e42ef13e570bf42cbf9ab77ee6098abbadd82e6f36966
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 10936 bytes
font_01_sfnt_off000125be.bin
574e4626b3a157b7d77e87cfa76992182638a37cd3b328357e52f9f90c291b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 17400 bytes
font_02_sfnt_off00015357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15357 16792 bytes