Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9bd75b0b2ccd03…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 15:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 507d9513050b9f5dcf781ef8e766f6dc SHA-1: d3ee00e94d7fdcd74391c5bd26f661c2b5b775eb SHA-256: 1e9bd75b0b2ccd0347a9d61a24aa9dc8a588ec3c2764f72c5b8624024a463797
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The presence of these links suggests the document is designed to redirect users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=forgot+my+android+pattern PDF link annotation
    • https://threadworx.com/thread/admin/uploads/file/12276349988.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d7690c7c---saforulipewut.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/nenupojizabelepume.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/gobugibixubinaguzume.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006a54b96d---21809640337.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/butojisunibosifaseta.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/didirejetisuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecf5b5b80---xekusetewapivenakunoze.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/64605379679.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/nanisipelukureku.pdfIn PDF document text
    • http://mobitransjogja.com/files/84218999767.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/755038c376d5686761c4914a2fe02eba/lomoxesironuwo.pdfIn PDF document text
    • https://ksboutlet.com/file/files/36996844748.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/88764461551.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/9473792207.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/babavoluf.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/rezabolugidakozos.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/sorewubufajaridukopemeso.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/20619204295.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/15a4adcaca6dbeb7727d806b456a956f/resagegowavewigasovilej.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/9131941350.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/vakatez.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/60866391303.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/98761597815.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/pavuzosediwix.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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 10612 bytes
SHA-256: 801c0525460ae200ec090a899699a508c940501dca6b78d911ec44b5b6d5bc19
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 19544 bytes
SHA-256: 7458cce5a9196ba2a2150f4b21f301165d5714fdec1e16e6b1aea269d6c95549
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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