Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ddbcdaad937241…

MALICIOUS

PDF

90.5 KB Created: 2021-08-14 00:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0e94f2c5862609ea7a50f5df0693c56 SHA-1: 8c8b52c87d2c41bc269deae3458d4fc7bb3b774f SHA-256: 46ddbcdaad93724152afe1e7239af0def5e20df38d6f8e8ea2a4b06afbc03051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=licencias+nod32+eset+internet+security+actualizadas+2021+gratis PDF link annotation
    • http://marinda.ru/pics/images/file/sumokagoluxuguduzu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d092ffcb84f---40603701352.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b73a0c64---85982389463.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/zorusonolajubazemo.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/dafelovolerebu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/5b75486de60940c53394f73986bf1caf/gizomitivavadod.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/8182670378.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8426805ab644a698b3ed9415ee60f290/28256936450.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4dcf13772dd449962e2b0b32be969ec7/96058480617.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ut120gfri1orjbucsnik4j8id4/99109659513.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/bogenolibosamed.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/21637d54f2a8df89f2755fa119dcb43a/10096482659.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b8b997845---46956264030.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/55614137975.pdfIn PDF document text
    • http://ipceurope.com/assets/file/15536646405.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/dubifabetojovisu.pdfIn PDF document text
    • http://renovator.cz/files/file/31718729654.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d37d2c95bcdfefcd2e4ce758b87c7403/bujibefomufi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e42f911a5ff---biludekepojibomuzukavasip.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ec480d70f1b03d0bd7918d54bffecbd4/nerurawokeresonuxarewot.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707edd45182---76713001663.pdfIn PDF document text
    • 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_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 18380 bytes
SHA-256: 7bafa5c418056b3e55d567c70f6e1d7cd9a81efc0b9821ffa31021e93f345174
font_02_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 11244 bytes
SHA-256: 4cc89c4820be09a9a4568d7d6ca4accb5ae0f7500de759b510f0cbdcc60578fe

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