Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f37b4f0678b55f3…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 07:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 004247002b417e4f6ecdac10743e352f SHA-1: 2fe142bf2612032936c994cc437350c03cc84365 SHA-256: 3f37b4f0678b55f35feca905e11f21fbf6194c4a2b4da67c70894b01b1fd9a3f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm hosted on potentially compromised or disposable domains. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=chromebook+office+365+offline', suggest a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=chromebook+office+365+offline PDF link annotation
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisiviwuw.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wolaf.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/bujetubatokoxogusix.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/popidugaxokiratulitisadu.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/fuwotujutomulazupilebi.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/91057714140.pdfIn PDF document text
    • http://checopharma.com/upload/files/30445581296.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/24304966203.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/fosadamakijivativ.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382c836acdf---bajevujufevawerap.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wovozovenijipalufisu.pdfIn PDF document text
    • http://shahgrp.com/uploads/20510909106.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/kogixivubetujapufubexeju.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/sepanakawa.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/kewofiluvigunizubekagixo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e424bc31ed---najosisutururuza.pdfIn PDF document text
    • https://tigaintan.com/contents/files/sibilufufasatesave.pdfIn PDF document text
    • https://andana.us/files/files/25924945078.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/16994775747.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/97366701320.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lamutuk.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/luvepadap.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140059866db7---78318074251.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/61564389558.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rogesozetidise.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_off0000b0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 14964 bytes
SHA-256: 36458724431f5a81dd014ecf74e5c8b054e090c31b7b9f321150ef350330594e
font_01_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10912 bytes
SHA-256: 94a4e997da059ac6d4aed9ea07198ab8339f1250183c492f2c1bf0359d0dda37

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