Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd72342229068e06…

MALICIOUS

PDF

90.9 KB Created: 2021-06-26 00:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d11fa6d357b54b05e681318e23a482a SHA-1: d9905385d80e92461e97c17a49129447ece33541 SHA-256: fd72342229068e066fa3bab153c2603c0197439896e96498953700b88897d403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://accesoriosalmayor.com/images/userfiles/file/86373761261.pdf
    • https://bruceautoservice.com/files/file/68226654362.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c551d90c5---vewerozigejozebojupezaji.pdf
    • https://galerieportelouise.be/userfiles/files/tobugozudufabugizumudire.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sdg2fklel6u8df34rpalkba4ic/43281534135.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/tukisu.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b527fe7432d---87927084644.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/55304230a0b89b278636c3c7e708ff3c/xubuvuwafalegeliwobaginab.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f9d26e51a1d05a0012a99b354c008bee/lilagogoput.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/fereb.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484266ec9e---58682681533.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8ca5aef1eed3080172673d2999424c1f/15339607523.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/47ffdc00a18053316aa6c3b609fd3262/92170727584.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/368517fdfb238c1926632f3c3cff824a/34347749748.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a991ba10477---xeburedebuzizupiv.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802a4f444fc---46953440690.pdf
    • https://sasalidayanisma.org/uploads/file/litonowuf.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/824d7a3d316a831b957ca64d4a2679a1/bigefuxupoxam.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fb131c6445d6621e4cc49ead99f1a798/jumifeguvib.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728c2f304a0---jediwojinowe.pdf
    • http://abacusnancy.com/userfiles/file/90815729592.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c54580eb---84517887593.pdf
    • http://brenno-tojestto.pl/userfiles/file/67569832695.pdf
    • http://md-servicios.com/userfiles/file/rapagoza.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c38510932cc---45642386296.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jesus+is+the+creator+of+all+things
    • 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_off0000ff63.bin
4ae648afea16f92f851ed6affbb49fa18679a5a47579b82dddd75e0f7879a127
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10704 bytes
font_01_sfnt_off000117f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16792 bytes
font_02_sfnt_off00013004.bin
2a0a49b6c9127de31bee9d566cc58fccad8f6c0a05014b6b7414b31106ad1247
pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 17804 bytes