Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce722c4b069cbae2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 16:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 783d013f82ab98de62e5af3989e4366a SHA-1: 03b7d4834aae560a08f04a2a9c7a52409c8fbf48 SHA-256: ce722c4b069cbae2487fdf75172171d9c467718037bf306cc24cee8510d0aa00
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391f45a7ac8---20834120233.pdf In PDF document text
    • http://labonscafe.com/userfiles/vofibibox.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/74846502070.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/60110485466.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe68a70e81---sagasazewud.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lipadowurapifupiwanozexi.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/77480467870.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/424ece10a9920ce435d5419d813fdcbc/46795890463.pdfIn PDF document text
    • http://houselandia.ru/files/73023724932.pdfIn PDF document text
    • http://falerisztika.hu/tmp/89062847255.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612eec89ac180---vojesebesig.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fceb0cca1---14166691817.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/3576592645.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/bomuxetegotew.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8b452a6d---60531352132.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/58596364611.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/warogof.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090221201021.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/fozojozufokufujegaf.pdfIn PDF document text
    • http://raczcsalad.hu/files/64029432597.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/tiguwolaligiled.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/mononusarokuvagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redeem+ps+plus+code+ps5PDF 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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10396 bytes
SHA-256: 780c679e506dbe59ee2712f2a8f4c5452b6770952da3022867095bf15cbd74ed
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 17384 bytes
SHA-256: 1be247a8aa0348d3576f6232492b6f4eee23a83d015212426b3cb12fcc4f2beb
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1