Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56b21ba6c3f521d…

MALICIOUS

PDF

78.2 KB Created: 2021-08-19 03:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11bedea67f602604cafbb480171d3bcd SHA-1: 1370d61101bee305e50ae8e57bc82337535a5fe3 SHA-256: d56b21ba6c3f521da5d572c8bdfb52966ab9ad282d15bb636c27664da4d036be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL distribution pattern are consistent with efforts to evade detection and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faa0d1a0f0f---xebeki.pdf
    • http://web68s.com/upload/files/36845195688.pdf
    • http://jrmhandling.nl/upload/file/42860202897.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/81175554711.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/89458233621.pdf
    • http://parkety-patemal.sk/files/file/rekubumirudik.pdf
    • http://ezstreetautosales.com/clients/876244/File/88285289989.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b44e258c31918800a81dc84fc77bea3a/gefetopex.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2a377ce534597b32daed346d42553197/mexekejobubufagipikibeko.pdf
    • http://turagent007.ru/userfiles/file/21807967426.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a280ea42---dogekekaxezu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c658a1b2c8a---85648316095.pdf
    • https://vicotelecom.vn/static/source/images/file/23458490607.pdf
    • http://canxetaidientu.com/images/file/39470724486.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/xudodirar.pdf
    • http://eventologia.com/userfiles/files/sibojegugizulidarut.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8401ee366---midaroxezupegapageb.pdf
    • http://axiomestates.com/userfiles/file/2562920658.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dfd680a4e7640b54cf8f182884ceba57/voxolunulu.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/1907372490.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/gijotebigapatare.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/vaziben.pdf
    • http://movitecnic.fr/ressource/site-image/files/92290086041.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/gesexawa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gangaur+vrat+katha+in+hindi+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe8.bin
2aca30ffbc2ebb20cec649172de3f2c89e72dc8c246bf91fce58b05a4078e9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 16508 bytes
font_01_sfnt_off0000f693.bin
b901ac91bcf8c8a944733f84115889b344a07a3dfecdd9b04769e410a9fe2289
pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 10860 bytes
font_02_sfnt_off00010f70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 16792 bytes