Malicious PDF — malware analysis report

Static analysis result for SHA-256 f643c3983eb24f5c…

MALICIOUS

PDF

113.0 KB Created: 2021-07-31 23:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af4ab78956466383c848924bf4af262b SHA-1: 4f0b14264f02f2b2d99d9085ea61bc60dae26a30 SHA-256: f643c3983eb24f5c5c4c3da0f6f6d2eaab7fa1915441fb8aa143b985c9a06bb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, indicating a phishing or malicious redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this is a link farm designed to distribute malware or lead users to phishing pages. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://infrive.ru/uplcv?utm_term=college+algebra+problems+with+solutions+pdf PDF link annotation
    • http://happy-travel089.com/CKEdit/upload/files/95406050843.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8ba73e7cd6687af25b253ef40e5da037/jomude.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/zabinaje.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/34401246537.pdfIn PDF document text
    • http://centrons.com/uploaded/file/155389847160d49f285573b.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/22e20f5e7f331cb3336569b6b7b2d48e/xiwajozivixut.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/2760481881.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf13538c0---zinugemutezuwiboxugav.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b11b6684464b24e66a7f381515c93790/xogibebupukobanuka.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff85badf662---nevidizozobupajepojogex.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/45346748535.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/jugazajageforuxizovubimad.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/614a60637730f8421aef72247f57efe3/60475865502.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35518bf62e30adc6e6ba16e12df3b75/10049132688.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/misememaxosesubabawim.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/49627949187.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/vetavaxunidazofijo.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160923b375962f---27857340239.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fuzadevubutid.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625429687.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/duzuxi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdfd0932a---71625772051.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e25440002ffb07e80c115d7123a7ebe8/zaxosezetewasibaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13602 20784 bytes
SHA-256: c4eda5c287048185a212d754a3057f010c42e6cb7034c0a0b94a8331f76a9fd8
font_01_sfnt_off00016a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7C 11300 bytes
SHA-256: 0ba81baa44e6c8993cca5f41c0c16bde39cfe9f62fb1a69294ed3fa8bf786b13
font_02_sfnt_off00018485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C96 17144 bytes
SHA-256: 79864eb75c84d593dabb311b4a337cdb06168adbc89763ccb184fa56522b601c

Open this report in the interactive analyzer, or submit your own file for analysis.