Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fe8f8052abe5b5…

MALICIOUS

PDF

94.8 KB Created: 2021-09-08 19:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e50d9d3ac05cb50d5ede52e608203ec2 SHA-1: 4119bf5395a394f0fa4d52dc20843d6f17d1ba86 SHA-256: 53fe8f8052abe5b54aa477619dee3b12ffee8b8982b55d54ef14f5b1317443ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The PDF contains numerous external URIs, suggesting an attempt to redirect the user to malicious websites for further exploitation or phishing. The embedded JavaScript likely facilitates these redirects or downloads additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://suaups.net/userfiles/file/sixafiwogepo.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9d0cc5257eb959cb7c3ba0284fe482c4/13103086459.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/genevi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/14643627566.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613211670b6ab---38923067237.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/55181494143.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/gujidavitesorokewof.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eff109bd2---pusuwogiwozemu.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/texejixiravajako.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jirox.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/75583509656.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/65047918845.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/nazoboliximatebizov.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/jugoregipi.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/29595089305.pdfIn PDF document text
    • https://morabia.fi/images/file/dajazubamidavupuza.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/todukalebowugidobetilu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4545c7ada---81281972537.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xuminuxudimanedulez.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ca6bc8d347adbd5c2186436b6a077a7d/dunojonukelobasamu.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fewezuxogekekepupuxele.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368f3a0502b---bupidatemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=limit+superior+and+limit+inferior+pdfPDF 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_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10716 bytes
SHA-256: 8ba05977d3e0d1f570345b014bc6ed11e970d24fb2881aee8530264936d8c00a
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 21612 bytes
SHA-256: b61f7fea9744f67789a8fc85a0d56bd9e83b9437593a3036a937f1d034053c77
font_02_sfnt_off00015556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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