Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd617d387e58723…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 23:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 42c7d8d6625f17c5916de057a377a1b8 SHA-1: 3b0070bbb53093b374ff9dbb2dbe3a49c87d7702 SHA-256: 5cd617d387e58723b4ced195c23f08d5f71db4433839980c27f063c70b87e694
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed bank instructions, a common tactic in business email compromise. The numerous external URLs, many hosted on compromised or disposable domains, suggest a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://krisoc.ru/uplcv?utm_term=go+keyboard+apk+free+download PDF link annotation
    • http://www.heksan.com.pl/file/27336754683.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/39867020827.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/28239758998.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/waxor.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mobevisadorobeniwi.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/80086364864.pdfIn PDF document text
    • http://vuason.vn/upload/files/faxumoragibag.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozusejixidon.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vojekonezufukarozorutenof.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/55668644794.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f931d0039f---zuwexudevinib.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb181af79---8996871349.pdfIn PDF document text
    • http://ymmicro.com/files/files/danedufimolapubisejuxepob.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/37677117071.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/nituxagagikusexagipejiw.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906194802.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/2719346703.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/jovigabelofasukedopega.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/afqf8ftoothdjic1b0ko8isd42/lodulogikapixujamefosin.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/rinajukedide.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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 20220 bytes
SHA-256: a7496c7154303ce3b7c3866d0d483cdcc71d571252a3b1f93fd1736531f36ed3
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10604 bytes
SHA-256: 1407db11a3add695618d79c88610d0b527d40e8d7479f181df75b1613c656523
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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