Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da7cba4c257d30a…

MALICIOUS

PDF

81.5 KB Created: 2021-08-24 15:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab5fe774fbccae2251a636ca5369408e SHA-1: 3e22cc4feb9bbcf6285c52e3a7a82481dffef465 SHA-256: 4da7cba4c257d30a6b7f1f9f60ceff55e44348af0cc1007e7c2152910c904251
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=registering+a+new+car+in+maine PDF link annotation
    • http://centralgiving.com/media/userfiles/file/roterosowufe.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/91555677076.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9pjpdfitqnefl3umrh63mrenh5/fojitopusavevinexatip.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a4d7fab8bec1d2fb6c483bc7e2f4f24e/53448461649.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/tekerikizuwerami.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/botiba.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f6e88c3e8---vuxibumitisosuxusexuzudep.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ppfogmsd3pbl5dthgao0dpk4ki/10779556850.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b361b5b2d9---46002827063.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/vamunorap.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xukezesapow.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/vanix.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/79643067735.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5a4f81913fef22d7b81a8f4236bd6e6b/32338857922.pdfIn PDF document text
    • http://normel.org/files/upload/file/razomukasunat.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f41dbc0e---42284595074.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b42ca9fc---lasese.pdfPDF link annotation
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2c3bf72be33f023f06962ef1f20d67d3/muwatefilije.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/20115819496.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160914e0ee3d36---duzejatowem.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1678c07d3c---lopifakajexifitivujigojo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2204a1d7ff75d7cc332fde69374917da/tarefodonupiginaleja.pdfIn PDF document text
    • https://badrivishal.com/media/verufazudebonosixugewu.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/jawirorazufemugabitufu.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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16196 bytes
SHA-256: b2e460fe5100e313007823bec94194b0156e92b34afabdffab77a0cd713ca3ce
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10540 bytes
SHA-256: 1d44f23ef3087e98387870f30ecd400c6fa880dcd4c8aad8f244f058d9332edb
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1