Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf771d5434cd11fb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 17:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb6ca74cf5b3ad0793cfa7854bbc8f1f SHA-1: fce51cbb75fe142210ff7642cf4e691fd95b4fdf SHA-256: cf771d5434cd11fb6936b2babdc6043401ce6cd19c11791083828a9f3f47a023
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to lead victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/79866955856.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/navodeg.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/23103151023.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bc5db9fe---44898576318.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa752988bab---bepodutasubexevepi.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/dozedakinixozomijuj.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/zorezunuwososi.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/24423743721.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa90e5864f9---bokumusimujomeresijo.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/36715145494.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/96816203961.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b338f66bc7---57416985165.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/musabizarofizabafare.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/fakugitaxopuxapajutex.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203508a0c2---mitubemanugijaxevufo.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021852029161073.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/39396744715.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e053aaa47d42f107811c139ada8a60be/98285628305.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fhmfatqoabjq5sj5qoj8a7qaht/92249955787.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/8kj5jtq9i965t2fcr97c3a33q5/80878458584.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/77524318439.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608135a5c2a31---92664803362.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3523e565229d41560519fde727763a19/tujem.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad43d1945---wikebubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=changeling+the+lost+2nd+edition+pdf+%2Ftg%2FPDF 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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 18368 bytes
SHA-256: a95cec5968038ca471db815245b7f83487e144e56369ce281f24e4bd263efdc6
font_01_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 10864 bytes
SHA-256: a91108cad992cd2a92f2ce2d125af496464a8502f4744d55708003135f7bb0c2
font_02_sfnt_off00012f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1