Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2bcadba72b319…

MALICIOUS

PDF

91.7 KB Created: 2021-07-30 02:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 069273a361439dede10f666e3dba6fda SHA-1: 3406225219b7b350bd96f61ba94532ee5cd808d9 SHA-256: 3ef2bcadba72b319f4a220e81ddc872151af71ec58a0beca4ec6b6cb5be4c74f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b605a894---62421953974.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ca9f2fe3246fd59e22489430ad2fff17/lonopisaguloxetisojul.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792c1ab4d5c---86463329335.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d28733f53fc7a36d4fd3b2f335034902/58946634779.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d35294a16ce---43177458583.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/61376007523.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vanuvuziguko.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee798d9350---fezotapamutokezogi.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/mixane.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/45425823642.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c37750873dc---xasamojawupisizal.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/49044266541.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/vixaxanigoremavef.pdfIn PDF document text
    • http://babamoleskine.com/files/file/9222066308.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/68508565638.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/89321727520.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca314156b6---45952191879.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29a3c77a3---99261831938.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc5533eed---27635125811.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c98ac816---fulajupowodi.pdfIn PDF document text
    • http://afslab.asia/upload/files/muvazuzexegebetama.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/takavewegizajotunigalur.pdfIn PDF document text
    • http://mosjob.ru/images/file/movigozubagukev.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/takogijiw.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/fotibujor.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/j7ru8v599q4au3g49mge2otsfd/81506107426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bible+verses+to+read+when+fasting+for+marriagePDF link annotation
    • 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_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16216 bytes
SHA-256: f18862465051abbf179d938e28f46e98d96607e0e1869ed5527a807607f49ff8
font_02_sfnt_off00014685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14685 11148 bytes
SHA-256: 5d1aea697f4f0ed128fc0a4c8bf4d37e3dc4358d8f555d1e7d96d26fd9aa116e

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