Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b20452c48dee0d…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 12:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44c84854603daa1bb099a0d592b65139 SHA-1: eee3cf6b51cb535a7ad0cbf805a468762088883d SHA-256: f1b20452c48dee0d3e54b0dae20a0e054c2106b981d38ff3acfabc034ee8f5b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary function observed is acting as a link farm, potentially for SEO poisoning or to lead users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hrmconsulting.biz/upload/files/pozoju.pdf In PDF document text
    • http://wernitznigg.at/files/51380510188.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vazixugizuje.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/96130570680.pdfIn PDF document text
    • http://df-foundry.net/d/files/wusaz.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/getuwivanel.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b9783cbf82f6bea49cd78d8895b1db0e/womigamorudufubanoraji.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81eda54c53---kegutedidibi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946479d015c---59556346599.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/40372652237.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/16788197285.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/27861826499.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0142457---nojaxisaxanimimulugox.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f6r2mrdm9hcbaip8pgdh1k2lho/93942642397.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/75964299583.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608772ce19406---morefojifinawiguvubuzixok.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4ffda4d5d1862107c90bd9c6470efe8d/98001037402.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/29688186013.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cca9664f3e---xasonedojabo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c0d82210---31044318542.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210618212743.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fonamudoxelunizarowesur.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/wipadexikulawawosimevob.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/10745875112.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/32047836647.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/43702380595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=scientific+notation+word+problems+worksheet+pdfPDF link annotation
    • 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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 17120 bytes
SHA-256: afbf5dd9670f95b051bd4346890a59656caa1199f93bd1c038efaaa13a0235b4
font_01_sfnt_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 11276 bytes
SHA-256: 095ef10c1726cf0e20fd9776666ff22d4ed3420f14095bea22157fda5dae0473
font_02_sfnt_off000143e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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