Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51a25cde62ed8ba…

MALICIOUS

PDF

91.3 KB Created: 2021-08-02 23:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: bcc56b58c69fa0d6d7f601da04a5192a SHA-1: 662d375684d63b6653a1367cfc3325665a6ff9c8 SHA-256: b51a25cde62ed8baf6462116db493eb9172711b291b5c08a2a6d325049d15619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content or downloads, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://greenvalleykerala.com/ckfinder/userfiles/files/liwafukipupakigiwoxi.pdf In PDF document text
    • https://ipic.vn/userfiles/file/57123905595.pdfIn PDF document text
    • https://plasy.com/uploads/file/kubalaverexeletaxogevij.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4df50289f---golalowinobijefov.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/7820439676.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/wugutibod.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9d23f11e---9853371419.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec2205c8b---4732903273.pdfIn PDF document text
    • http://fygl.net/uploads/file/201744356198.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ebf81bc032dfdb27088df873ff899deb/26547310917.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08808e408---26310503728.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/dijinjo48775dtcdbbn24j3c70/52929214591.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/01kv0c0pl6af9b47pa0ttb1ng4/todisuwe.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/dadipexigogesoxex.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525032339.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jeboradexenuzodisogofosem.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iul6s4h69bf5dnjjuld41aljka/21101741213.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7ab5f1cc---97104559327.pdfIn PDF document text
    • http://russia-ex.com/25880858211.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zexepilitumis.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fb2c8582c---80824409221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sybil+flora+rheta+schreiber+pdf+espa%C3%B1olPDF 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_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 18032 bytes
SHA-256: e34d80819a4b67e42b4290cc6db2e375f3e66336255e8c6d3bf3282337c9a7ce
font_01_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 11148 bytes
SHA-256: 0b402fc253aeff23d56d989716cc8a8ca3265ff7019b628808041c7a23b7396d

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