Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d3866933a44f4e…

MALICIOUS

PDF

107.2 KB Created: 2021-08-01 08:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bd7577eff10d5aad9c7eaabf818ebcc SHA-1: 35313745d610ca79cb452d2e3bb04a46face5a37 SHA-256: d6d3866933a44f4e949cc5b720f68b87e01a134b40c473b4ca83c6e6c7553553
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. It functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The embedded URLs likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=super+smash+bros+3ds+character+tier+list PDF link annotation
    • http://vivaibonomo.it/userfiles/files/sikagemufufowiwevagaxeza.pdfIn PDF document text
    • http://nineslash.com/user_file/file/xorif.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ibktgnu9376svefs642schgupi/40373438649.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/xazilixikijoxodes.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/62063024814.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/zivivezawofofonigivog.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e0c3cb34cfff60149bc2a5fc72a38402/94640855819.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/91766283826.pdfIn PDF document text
    • https://silga.ca/userfiles/file/91339636428.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99a381155---wafatugerodexukazarugim.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e6ba02d1---86290499826.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/79616769840.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001e53b99ee---32954000788.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b6d16a18---fajubujewimu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c702adaad70---21646773407.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2966369d9---vivuvepuzurem.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550784599e---zixanogevegudagujaramebaf.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/62389113721.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c2b80608da1928f8359dca4374964443/doruvavujalamemizu.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/kubitobe.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210718222626.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/vuwonorefoluwag.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625ebd82b1---32920531223.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/31023005030.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_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 19328 bytes
SHA-256: 4869b83261c00db9b1d3195410daf57b3fd70d4a5e54a21d636563f5f2dd5c7f
font_01_sfnt_off00016aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAD 11160 bytes
SHA-256: 6ca036d060c36b4bbfc34e8f55e3b52ddedfee1638bbf8cac3482bea4c217d45
font_02_sfnt_off00018489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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