Malicious PDF — malware analysis report

Static analysis result for SHA-256 153f5cce1c54da45…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 10:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c05e88740399aaac58ab68d502c4e7f7 SHA-1: 1a2a3c1d577579d84c334b99a77bd3ace89ca795 SHA-256: 153f5cce1c54da45a6101b3c4764fdf129da5fd4724ff165a3e9cf1fce860cd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=largest+evangelical+church+in+the+world PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6dbefbc4---93258636184.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83da9f9ee---dutakomajezoled.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/63979556978.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d0c722908e115e822375341bcd1598b0/ridis.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/xenanaxe.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mizuzowekujodonenuf.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/73124051267.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/93681830648.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nojazewutebawifikegufo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e6a4273e---87894691122.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3215ab93---lunamijaku.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fuponorijedowabitujujute.pdfIn PDF document text
    • https://empresa-venta.hr/files/99790742272.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/36829167614.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/51bc4e19622f5edf69c7efa26e2f283b/fisaxiretadolu.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/bobebulavul.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/xesezoguvupefibevuduk.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/giwilavumupatona.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc1d57063---96618927954.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/54739472546.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8f8bf2b7a---74460947471.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7cbc6282---64507300896.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021731726185176.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/94856288669.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_off0000ba68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 15220 bytes
SHA-256: 1c34bf91c1b8f45ad72cb750be8af3c35333a735f719d731fa5c0cd5ad4ff550
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10856 bytes
SHA-256: 734a8824ffdab3630f86fd08f9ada612faac55af59fc56d4c11710586a32b109

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