Malicious PDF — malware analysis report

Static analysis result for SHA-256 1258a3d85353f141…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 11:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06604582219b24e20a526532f665b42d SHA-1: 4f146131c0a4195d31a76fb9bbe01face7bb26a1 SHA-256: 1258a3d85353f141c127b3a6d9595c77b56a61bc0ca4d337dc1b465be3126097
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070713d3cee6---dekukagaxavoxovuduvoset.pdf In PDF document text
    • http://hondatayho.vn/images/ckeditor/files/sakorutofojipagigo.pdfIn PDF document text
    • http://premo.at/userfiles/file/8345043019.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/baxaxajikutam.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827b72d1bdf---42209973805.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/17366038898.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131204ed47db---nilesonozusosa.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ke7ivk6gmqku1flsaglpb99jrd/sugolalamevokefozotiz.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/87415732790.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/20964161217.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/r14p65et2kqrd4dra2bodsesd6/85654075842.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/da848249ede7079855f1206359e774f5/9639637767.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/15004893909.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/babuvuxuxemuwusuti.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56ec1f1ef---sigizogoxevogi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/25124427136.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mejobo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c80184832---67869770526.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/21395841060.pdfIn PDF document text
    • http://poultech.net/d/files/rowogeze.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/23960799156.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/95345132265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ibameo+mutuelle+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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 18888 bytes
SHA-256: 33f78a4005b14102fce9427aec15842c7f1e7a7ac7535c5e2a64f0869a5e611a
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10388 bytes
SHA-256: 95b3ea39cdb6ec5e5ce4a60c22fbb18af3e6e4c0c93642f793b4dc915363e2a7
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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