Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37b46eb8ecd5226…

MALICIOUS

PDF

83.0 KB Created: 2021-07-03 02:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9f907e9ea5bac4692858afab2d2641 SHA-1: 13e9ddb3f3ea94209002f62d6c544db0160c6ad4 SHA-256: c37b46eb8ecd5226a1ce20f1f1f2e1ee15e7d765daad656a5b16ca17b0557ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL findings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb7b3fadd---midapadameru.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kidufuwukibuj.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vabupaxe.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gfqe9qiq2looce6uu1ema05v6u/48925312689.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5c3e317fd99fca97a201b4c71dd88b75/11182731122.pdf
    • http://griswoldremgmt.com/uploads/files/28868315024.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fe4431868---nakiviwosaxuvafidazaw.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/j9v33d4q93sngich01qntads41/79942924668.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/un2ibagcprvd451fp355ntl56o/8259040669.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2tbgfhff05r3pq204df4iv3a4q/zijapulorajizuxa.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/96845149452.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0807324bb---jokabazirororurujaki.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160727f9b6f054---netubapuzojodo.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/dalibodaruranavejasugal.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ee673b4a---90180057122.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1q1h34q8nbrdlrj67dj2lcnmrt/13450903760.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/94036253769.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/70f3ac4879318f46462aba2a0c93a3e7/xitipixapal.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff37d5b78---85812025630.pdf
    • http://djpress.pl/Image/files/tutija.pdf
    • http://bukharageorgia.com/sites/default/files/file/58641102363.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b1f913c7c---tilelap.pdf
    • http://muszempilla.com/files/file/32860252916.pdf
    • http://jtour.vn/userfiles/file/22693122040.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/k8vdggirrdmf3afvf6eridvio3/lozogonegivar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dark+theme+settings+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_off0000e13b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 16792 bytes
font_01_sfnt_off0000f952.bin
4386bae7ef8fb5b939b9454f09a7a6d699313e0dbd287dd6d0271cfe2adb907d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10744 bytes
font_02_sfnt_off000111a6.bin
9729de045e472f3fd7b43f972ba2ead9c7dd7b53debcbfec1f936ecbb545bb37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 17080 bytes

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