Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabea082eff920e4…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 09:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6bcd04c11833fd27fdb29e8a4ce1bca SHA-1: b361a7f236e6e70f8b19f9ecc86a16935623101a SHA-256: aabea082eff920e49ebcb79d4ce46ce9af9dcf3448020bd7cdf4a6d71c924de5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://taiwanglassgroup.cn/userfiles/file/dixitisutujun.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/74427685229.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vosedolusifulekazuxe.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607947d82a3c4---pezepinolebexese.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/8428183889.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0a088390f796230cbb29851733182684/dutesivukigasukupiwuso.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/66809778113.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/guwasisinuroxebo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608250e3e1aaf---35472499231.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7da72b6916141b573cb8457a2660d44d/55397189216.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7ee6363c0c696551f78c1c172e9646bf/11876577930.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/torarobuwelekem.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/koruwunisidategeputobe.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210616084828.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b019ubmrvaf3gohv2ekcf1vk7i/42434309765.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503130902640243878.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/remisixuduz.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/xofipukezemumef.pdfIn PDF document text
    • https://mmszke.hu/files/file/melosofikulana.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/44e588b937ed86d12baced897df2cc00/bivozafexusujexutus.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oeh7lqmhdheqde2ip0os90nmv3/puluda.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/81322769582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=a+pear+shaped+bodyPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/retezuzefelunemibu.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 17028 bytes
SHA-256: 9f9086ff607059ce7a7a8948ddce41e1c845792783f32afcf5f7d92e88de1908
font_01_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 10384 bytes
SHA-256: d7c89c84995981b309a4f55fd0091c4ebf7e1f9afd6324b575aacbe73ea3821b
font_02_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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