Malicious PDF — malware analysis report

Static analysis result for SHA-256 9123f67eaafb5ba2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 10:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9197b6b36f11e68fad16e16aeeda27ad SHA-1: d51a39f8a3a6112e4eb3e299c2ded75bffee0166 SHA-256: 9123f67eaafb5ba27f208cba319da96acfb15af149c07cd445d2835033484c11
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=linux+remove+pdf+password PDF link annotation
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2c55f26e5bb633e04f7b4417fe95284f/61513669460.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613244ced349c---puxexinexodibadorewogigo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/99047be0e653bf4838aaf4f712e89c21/22855497812.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/gojifilozamekuwanorazepa.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/wosubivoz.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/gotiraxotamogi.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/955745167.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/131911197495.pdfIn PDF document text
    • http://aromata.ru/upload/files/jimaj.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirefefukimudif.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/71673565481.pdfIn PDF document text
    • https://magatek.com/documents/file/36857526669.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/21628521964.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/10726598015.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fajivosekexerorafulara.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/77778675970.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/faxavot.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xikemade.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/48170362080.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/58528242514.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/96594861945.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/57477056271.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/wujurepadonekogixezog.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/mojodimovatewutuj.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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 21180 bytes
SHA-256: d67f9f7ea172e168587dc5198c9d281c96cca15502e87d6ebdfb41d3028d3260
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 10828 bytes
SHA-256: 5a03e846905baf2a64a1b782a8a6a8dfd710f12072694fa5b2a1e5779376da3d
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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