Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45dc55a587029c1…

MALICIOUS

PDF

73.1 KB Created: 2021-07-26 08:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b125acd3a417e88676e93b8d16efab80 SHA-1: f1208a26b4cdcdcd8f844adc03dd7c42dc903fa5 SHA-256: d45dc55a587029c13247809923986c6c7f1105b96c082c6a4310e43e2a20e6dd
172 Risk Score

Malware Insights

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

The sample is a malicious PDF, detected by ClamAV as Pdf.Phishing.Trojan, and flagged by an ML classifier with high confidence. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to trick users into downloading malicious files. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://due.pt/js/ckfinder/userfiles/files/50284741913.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/efdb09cfc4dd5de391cf15f1c9d41568/28024274039.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f876740d1fb---lanewukejatenukoxivusesul.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lovefolunulijuro.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0d7bf614278be53eea36746f3503276/lorefowekereduzuwisif.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f0c2deeba---zelakipirukifipatoximabo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/23351256904.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c3l3cv2nqmdipi011ppk9mktn5/zijalu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d161c64651---13198357801.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/74147848134.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c2441214---48950282334.pdfIn PDF document text
    • http://billsky.ee/files/file/nilulidupuzupovodumulujol.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/pisegajome.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/15422851029.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/89602037600.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3632f3c30c28e53ac8542ab3ea81fafb/29722906744.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wikaxukumu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/50086038064.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831ee9cab7f---movuxiriked.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4df77b5c---piziziju.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mipepefukumi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1395b6161---84663588714.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcbd41250c---42573431847.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608259469a3f0---33849916077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hdfc+pay+in+slip+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 10472 bytes
SHA-256: 377394ff545d5f7fb7623ac95471c21dca44887a90871a9732f53d10c7137fe0
font_02_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 15992 bytes
SHA-256: 651dd4d6f7304499b033fb8d7dcd9c960fc3d5dacfb2863cb1904abdf3bdade1

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