Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caea459c33500d8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 10:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 449cbaa38d30b3a53bb272dc800f9e21 SHA-1: f1c763f1fe8524d58c525595048fb6373afb7796 SHA-256: 5caea459c33500d82944b0ef716acedac095aeedd9ecf5509b406664a579b409
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=sword+art+online+integral+factor+protagonist PDF link annotation
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26325633529.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/48361185435.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34e8eb06d---42249923885.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nevudajub.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/sasigiworuvub.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/13711386186.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/92850949706.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75d4326e3---papekofomisuranaf.pdfIn PDF document text
    • http://elsped.hu/files/file/28049710096.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zafirozurunapirebato.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/joponukikasizuvasigev.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccaaf2eec0---julor.pdfIn PDF document text
    • http://www.moyekolodin.com/files/35512426069.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147d71430ef0---96883226926.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/98145856568.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zuvuwuxilodubekewe.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/vokurasiwituruludowazudus.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/xarusekotabukumew.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/97583045916.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/22137909604.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/paxepajamoralomafuwalut.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_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 18220 bytes
SHA-256: 58f263fe3ce2879b17c8d5105513e7f64f091303d98c4bbefdae1bf3fe9a88b3
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 10956 bytes
SHA-256: 26869ede769991a5efc40a4b1677b7715d30779da859728130dbea42c94d2b64

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