Malicious PDF — malware analysis report

Static analysis result for SHA-256 763575d13f76c8b1…

MALICIOUS

PDF

125.5 KB Created: 2021-09-05 23:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08c5fab746ee531a2a4ebdd275b7e1d4 SHA-1: a3e208619a571f21474d6e874d5eb7ecbb092827 SHA-256: 763575d13f76c8b1fd1330c55c97cfb44d83e938ffc95fba9897933a1b8bd05c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress sites and potentially malicious URLs. Crucially, a 'Clipboard command execution lure' heuristic fired, suggesting the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. No scripts were extracted, but the combination of phishing indicators and the command execution lure strongly suggests a downloader or droppper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://inwebjor.ru/uplcv?utm_term=all+cmd+command+pdf PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e352935ab789f18df9966b7d0466373/90761699187.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dacdc827acd---fanijonu.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/zisarodowoladobimifalotis.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828aa29254d---zomufo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4ee5b16b4b2a97bf927d48ef90b28ca5/buvarisazi.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/puseburube.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tamurip.pdfIn PDF document text
    • https://ayurmitra.com/files/file/pefudimodipulefojewevonax.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/sozapasaba.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/lelifuk.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/bd4c201ef107dbfb573c914b71fdbb6a/lurasutuwaluwu.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/kigaxefabagebuled.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jeraroditewi.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64482696327.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/fb3lmc1jbuj7r8ll480p1d0rro/dajubikurasexuvesoxudazam.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/17006063151.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zisiralazotobadefotoboxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d50a9f9ab---vibetebosutapekorixiv.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/89148183269.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/33397203305.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/rurenivugojizoko.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16110308246b04---wokujaririnalabix.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/28dc40ca219d18123c763a5dc02c241b/rujeso.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_off00018bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BEA 17752 bytes
SHA-256: e7ca3ebf4814f65d22867c4a141f8d487ee2bd1f2d07bdc22cb409a76ea05214
font_01_sfnt_off0001b9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9B6 10172 bytes
SHA-256: c2f0445a4ef0d7683b1c58cf728d2b0377f0e199c3600051bf59090338532344
font_02_sfnt_off0001d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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