Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e09f56e07dec94…

MALICIOUS

PDF

81.3 KB Created: 2021-06-30 06:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795139e20eb9ad6755f4ed6f1273d4b6 SHA-1: 277e5b2308c07c6ca850ef6c32ceff8c9fb919fb SHA-256: 77e09f56e07dec9481a2d631e2881c0410cd32dcb89054829322e204938f089e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to WordPress upload directories on various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e57f17df---dafopewujenatumepuzob.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aeu7ff12394faphjuscksvllo4/91552622549.pdf
    • http://nickels.design/ckfinder/userfiles/files/88933261755.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7e9cc4a2---93678823904.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pd7pr5b035p83vdefo7kr0ib47/vekipelavu.pdf
    • http://vom-ragnaroek.de/uploads/file/valuruga.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a7b8def8919647f320dd8d9a6a5e625b/luvigafa.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb0196a420---somuwagopozazefipewowef.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dedon.pdf
    • http://kimhoatra.com/upload/fckimagesfile/gelupa.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c6f31c8e598d094834262285158015cc/59397612419.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48506993a0---gigimasafikurabubox.pdf
    • http://parentini.it/userfiles/files/rameguxivupinuzanogudit.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2414bfb5c46e431f6babad113b2837fc/62605176339.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608719c957f8b---20057917056.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/474bdaa2c8d0c03ae07da92f9f089426/sotosavuwodatagevogomejaf.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ff43c9e6a738b5d286bf1ed2cee84fc5/87494364274.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f46e192c730f6b77839aeb359491acf6/44537789046.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073aba94244b---77693659681.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/284da0b49075428ee7dcb52ec9d2457b/tizetalesuda.pdf
    • http://pusancard.com/userData/board/file/mowotejabudefosipu.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157df00846---lujusamolimupetorafuna.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3ce6v5l6m0v1t4gd9a7kvedl5/jajizovovufidirasabopi.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45b26ac494c713cd6b03e15a50938623/kafamawizirofamijow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=factors+of+32+and+45
    • 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_off0000dc5d.bin
60a70cad15d2e9c6b26bfc24457bfcb301ded0798724b53d5623253991a42863
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 16560 bytes
font_01_sfnt_off00010779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
font_02_sfnt_off00011f90.bin
7e7ee5914b8ee81748c705174108647a754c18fc5a9fee7b8da77a46761bd8de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 10680 bytes