Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acfd622e57cfecc…

MALICIOUS

PDF

93.0 KB Created: 2021-07-13 01:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff1e4e31bb9dd8c41c09c83b023beefd SHA-1: 063fdb649c05d81f2ff6d97a1c3c77b40100a96c SHA-256: 9acfd622e57cfecce44105c0c9a01d387995a7a535c6dc69970b2ebec0b48fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=the+conjuring+2+madison+wolfe PDF link annotation
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bnrb1iitedruqeo830895d72d7/dejosepelobagazabajofog.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rhlt86k57gcnld711nj8itv6f7/gebupesogaze.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b998d0c9d75---77309095471.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/rikapinizewudagita.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/eluhh2rjd6rmg2lckskmur2k3n/raledereminuduzevuzo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889a0acee89---ginerigoviwajarilo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/binufumixiwera.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/75227650699.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xonoruto.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/52261547345.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3460ed33bf61ba55a1ab53ecebe05326/2850471655.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7b168e8f---tamexokam.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160872c6222c49---dexafelefobixerasubamipe.pdfIn PDF document text
    • https://ebooksweb.net/files/file/53849341781.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1985c9fdd47910c072cead49d7fe080a/jeguxuviguneferuri.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ade1bdf4---4727424404.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jifevimakegifuniza.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090672b05596---74209183112.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bubibefokokof.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7hjgi1ih9app4gvqk9c551itm1/kenametolaxi.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/rosiguxupexelam.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/72316118232.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbbe3bcb4---pakimopebuwonifijud.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_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 11224 bytes
SHA-256: 0c59aae31a670f19e3a6c7b3bfe1f9d63609f23d5efe20e070bbdc3d295a2c65
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 17392 bytes
SHA-256: dfe38cc3b5f1ddd593643aeda702254f711569002c0387c352369beb8651c41a
font_02_sfnt_off00014ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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