Malicious PDF — malware analysis report

Static analysis result for SHA-256 457d46a470b2cad4…

MALICIOUS

PDF

101.3 KB Created: 2021-08-12 15:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 56535f298b1eb6fb323bc54725fc7386 SHA-1: 19c89dcafb87fd904e01881dca78d08aa5232911 SHA-256: 457d46a470b2cad42c51994c5fc7cdc2d86c375418dc81916ed68404b2e95250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=audi+q7+manual+2020 PDF link annotation
    • http://brandnewgoods.net/userfiles/file/15900251502.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/91172937515.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/1726877057.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/26123531426.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dijetojofaw.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/87201434271.pdfIn PDF document text
    • http://pinxedien.net/upload/files/54526311337.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54bc99f0a7---13507250421.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/pebazemox.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/9884920120.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/12f0fcb539997f8917af6a0fb8527e9e/35216130174.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lhgjlh291213tj8bfmbppup457/kanomobatewazoj.pdfIn PDF document text
    • https://haidangpc.com/contents/files/sugobivijejuvefotulag.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/76276279019.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/38a7d7b54002e6d40b43e9969bf1826e/pozilivedofo.pdfIn PDF document text
    • http://citra.cl/userfiles/file/gunubilagipokiwutewozi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/98516431159.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/vugiviziseluxusodutilu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f4f63dbcc5475a3c6cba60915b852f/pifixezino.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/likozagivijumovetobafezat.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dede79779---77151247691.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/xelotegorawi.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/tibevusoxajuwaf.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3924335e---71901958704.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0p04b7chnnlk0m96qe1cp10hn0/71437573534.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_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 17412 bytes
SHA-256: 87aca7bed59ba81fb03da103dff449940f92621237c4045ad3fa3b621e507a99
font_01_sfnt_off00015637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15637 10312 bytes
SHA-256: 8061af45bde725b324cd62617d1816cc3e76ca2f07ff8d77cd78c3e19258d5ef
font_02_sfnt_off00016d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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