Malicious PDF — malware analysis report

Static analysis result for SHA-256 32310aadde55d0c5…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 23:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0191605462126d53a2a355eb6f8849fa SHA-1: a768edbde40fe34caa2513f56f9555d366a1cf1b SHA-256: 32310aadde55d0c50f308177a2b82d1c088978aa0b26e22c1ae95818a483acf7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to lure users to malicious destinations. The presence of external URI indicators and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=4+sneezes+meaning PDF link annotation
    • http://brightwayconsultancyservices.com/userfiles/file/somulevevolum.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3c543f40---11131233051.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/fakure.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/dojakabuwabef.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/56d9b3d6b6404bfc78e002da4673bd63/41930859705.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85ff37280---mutoxenavefefabarononedet.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/15fa98c54f289eac6e658a61dcd9b09a/65498440868.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8e17710906ce7fea7f269f8ff9ce5591/jijarujewitisij.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a9eaad903e2746d5937f5f8976073222/66327377707.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/24ec8dc5ec5f582e350547232d035481/26426900889.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/77b3128cc4a4a8f5eb3760d9404dc856/bizubefodidexegigorowedig.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/86527351056.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a5ba25098---tarexiw.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/37978720419.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/61578580727.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160983b375604e---22407053292.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9e6acc604---lenumadagej.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608873020e02f---30483063221.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/14085551226.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e64a69317a26bf5985948e7cc55ea7e/56084890763.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/dusibamada.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3eegav9ovrjsrvoddmgtmok9ua/14609270563.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/9ijbjt4n2i2g6gga6hjiji0482/wisivavasagekawi.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/a1daad8274a6bd38a7d247ca02fb8b78/sejejituzobilaxub.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa95abd95---81296014898.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/efdd052c9a9fdbcd0f0fff52dc111ee9/sawonola.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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10128 bytes
SHA-256: 19190020154e301fcd632d9a43fc87fe41be73ecadbd9c56876bced982497c2c
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16532 bytes
SHA-256: a97b6d220841e110c98f896557929bfd1378ad2ce68c24c76c8c4561b9a8162a
font_02_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1