Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1a4f48f2c41158…

MALICIOUS

PDF

109.1 KB Created: 2021-09-01 13:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90911d8ccdbd82d74040b839d015c447 SHA-1: ebcef87aea2f6b6037c013ffa911b18ca4edced1 SHA-256: eb1a4f48f2c41158883946994729c8db59892cec5950878df542f674781db32e
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, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=how+to+factor+the+sum+of+two+squares PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072852dc04bb---batex.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/suxegug.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/71387357085.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b590a23169---38410967995.pdfIn PDF document text
    • http://msiutilities.biz/documents/devegomot.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/nukowatuwesera.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b784c39d831---faborivakatuzafizo.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/nidafiwi.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xaxaru.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/bobukokesogi.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/80153926923.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/32464675844.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f3ed74a7873926c49a162ba9e2a5a2b3/45266997160.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/fesefapetubuzoxo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/beresonixofubepokutezo.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/serukuduleguvixuker.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/2905241404.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/36651481870.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/ritazedobisab.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/30b2bf25159798220af2f0a11a15cfe7/kufug.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/kewasokijaderus.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f6cf2896667c38f074f6db81fbeb7ca8/5312566548.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/6kme3bsfqts21knu41a50o26t8/nizej.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_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 20484 bytes
SHA-256: dcc801a0043daf510f35b8f899d5d43f35542a61d30a92d7b16621a753c5e95e
font_01_sfnt_off00017329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B40 10684 bytes
SHA-256: 22cb03065326aa5dd5047e96b7b1b215cb25bc99606e18843f89f7f079ac3308

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