Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b9971fcc71ba4f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 23:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4df0144a1031a2b7ccf4f767759102f SHA-1: fdb51430a46c633988eae70ae9d17e5a924b3a21 SHA-256: 33b9971fcc71ba4f3dbfe15a5310bf09e85b5aa071c2f6f2bd466df1bb6a4e3e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised CMS uploads. The presence of a visual download button lure, combined with the ML classifier and ClamAV detection, strongly indicates a malicious intent to trick users into downloading further payloads. The embedded JavaScript likely facilitates the download or execution of these payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bouwbedrijfbouwheer.nl/userfiles/file/zaxadovekiv.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135975e25404---kezafebaradedeza.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/27115165095.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/67975999800.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d4a691f4237025b60b1dd5dff4321872/54698544090.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/46565782195.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/68203257708.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/zonikujodijolugawebivobe.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/karalibunebotaraw.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/98215992906.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/1583217657.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-1/20210901095823431520.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/5220836095.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xunuromasi.pdfIn PDF document text
    • http://hocomesun.com/upload/21146769199.pdfIn PDF document text
    • https://ratosatu.com/contents/files/zitupexawa.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/43362086599.pdfIn PDF document text
    • http://mobitransjogja.com/files/62505408700.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/33885ac5102c3084ac6148b5fa577050/sanavawe.pdfIn PDF document text
    • http://ranchobg.com/img/file/vipagokirutuzewukagovuto.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22807670458.pdfIn PDF document text
    • https://soechi.id/userfiles/file/rifawiwunusezebodanizixu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/62000579400.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/50709424598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=website+for+free+movie+downloadPDF 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 17788 bytes
SHA-256: 2c4f48ca9f9fecd22bf6c2b7fb544d53b0b0b01d4006d8a8345ed4fbdb4917f3
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 10800 bytes
SHA-256: ea63ff979aef609255aeef2465b5a887ae2cebfc9d84a9e0daf0b8da8fcb583e
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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