Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e67760eea3220bb…

MALICIOUS

PDF

98.7 KB Created: 2021-07-23 09:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fff9a480cc946ed1ded52e57c7a213f5 SHA-1: b4fccbecf15f6aa62a3fb5ab4e665c17f4aadf92 SHA-256: 0e67760eea3220bb6e3991b6f59f8fb45b98d101c60223d8c29631894a80ef81
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a phishing or trojan-like intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a link farm on potentially compromised infrastructure strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://amrapalispot.com/userfiles/file/46537161145.pdf In PDF document text
    • http://angelescare.com/userfiles/file/80854682046.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/panegamiva.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/37417748599.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/dotod.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759032b8504---92612704913.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78be8239a9---61841475407.pdfIn PDF document text
    • http://lyshiying.com/d/files/karor.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/lotituwanomugovonudepuves.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/37647503986.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/afgine8k37idu4dg1djg9coutf/nemit.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763fc08ebd---dekodibu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b25c212f---wutafifus.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/35081029370.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98d798a50---gapopo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d20baccb---10783353399.pdfIn PDF document text
    • http://asfalon.com/__files/file/loxinumulomidumuzejupe.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/vekobazigekexovakab.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106291032103580.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609837570aa0d---54768455795.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/kowofawixetox.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1134b17512---94564109708.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b6ff00999c2a8ab31ffe7c69670814e3/wexesotijopusavilanerel.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ee85c88b---befeduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+the+word+redressPDF 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_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 17168 bytes
SHA-256: 1ac02dd59698d5d5abe2683a9f02dc560cdb7d68f3995dc1009e376b225b1504
font_01_sfnt_off00014c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16469 10668 bytes
SHA-256: d448fac1aeeb431bd8df21b3e8d2b42372397ede41f647cb1f4ccf0e7db5104e