Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ea40c5c771fb0a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-28 07:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c689e3d91e6ccf033990552f4f31a09 SHA-1: 71cb2a6af0ef784be7d7f440f4a6cd80c93c0461 SHA-256: a3ea40c5c771fb0af0e1ae4d340f928de7558224248e7946631dda60fb4987c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body was unreadable, but the presence of numerous external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160798c3e89fc1---mijugibejokagesunoluxe.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/56f839f1cf65a69ed6dce5003378055e/samomodefibilonigur.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82adbcdc3---nipase.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/wumekameg.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/gudamefuvixise.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbfb77baf0---46132065291.pdfIn PDF document text
    • http://waterreducer.cn/d/files/13015035619.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b10da6b6c02---sabogajukilip.pdfIn PDF document text
    • http://denge.aero/upload/files/mupuranus.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c64cbdce---pigatukolojebupubab.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608360800adb0---redevikabevubumevikojin.pdfIn PDF document text
    • https://parc-hotel.info/file/4419079128.pdfIn PDF document text
    • https://tavio.ru/files/file/zopum.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c4f7c92d08b8def49730cfb714d19183/sijan.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lampghb7i8cfhdpqi5a2pv12ve/92835457933.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f94e48ed2818e2e3674cfdb8b9debd45/bilutofodu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/612e4b8191c42d275d1d5e01b791cd61/69322768591.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49d27571e---24595126740.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ada523dc---zinegobesupiwir.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/25211889949.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/81925809943.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/pefizagoruzasox.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/349d67cd8f89e546b14874ae0b27a426/wizijudanuxulim.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/dezovulafamidevam.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/7745410033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+principle+of+biuret+test+for+proteinsPDF 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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 10812 bytes
SHA-256: 3d3b8d8fe45de5d9fb9d21f53b7a809031c696d549dec692002e03c3773f54a0
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 17520 bytes
SHA-256: 18ea13987591f959186cf84f7e60ca68ee388b8d86cec4ccd5524bad51b8bd48
font_02_sfnt_off0001385b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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