Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6ea30083af7c7c…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 04:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dad566cb0fb653b048c31499fca04ca4 SHA-1: cb2b0513d3851319d77662bb16c4ddedf39430e2 SHA-256: 3c6ea30083af7c7ca2db09cfaebec926255759cf309e81b7a69c8cd161393cf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, with external URIs leading to potentially compromised WordPress upload storage and other disposable hosting. The embedded URLs suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=accuracy+and+precision+notes+pdf PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/tesaxivumamudafedipesod.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f7bbdca5---7252221029.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/so3tl2c375tshtdgeos9rre8m3/ligoziv.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/skfap4elrpilfah5git7jkhh11/jixobevuvivorebofuf.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/gopelu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/33280046472.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/45758584065.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/46385704453.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/pizibewijinekumebosol.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd61e42b047---60749592046.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/luwerirukaxisulemenikep.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/u3dqu4r8241v88112jf5i8kkuc/linenebogokija.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/lixanitodafoda.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kukemasivuwawipulito.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/87207940560.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c0d5512322afc2be82110d42314771b2/8545572214.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/99268366111.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/vupizudetavuzofinulipu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a94536e1b---55459268188.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd41853f6a---kefawowasopijo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032050575838.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b71877ffcb---79976155390.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/60586728801.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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 19816 bytes
SHA-256: a053bf85f3bd6e9d12c840a11f1fcbca7b72a4827cfb5ce9673bd74c4a8e27cc
font_02_sfnt_off000140d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D1 10760 bytes
SHA-256: 48d2d96247f056530cb1dca0f76da9112543230dd04c607cf7708b07ad51b2f9

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