Malicious PDF — malware analysis report

Static analysis result for SHA-256 9542de1630c2f3b3…

MALICIOUS

PDF

85.5 KB Created: 2021-08-17 17:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29df8777602e5054f92bf57a8299c1aa SHA-1: 0c31661917caf32adc108196928c5c0f04e7425c SHA-256: 9542de1630c2f3b39f9114f7aff9d1870dc580959f6f2dc355e4a3a8c5988563
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=what+is+intercostal+muscle+strain PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/93119977680.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/49455211161.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/57449517998.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/pemavogamufudirupeb.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/luxifikerifekageti.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/34391110506.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/xobijurebovezoxamowegisa.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/96345321892.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/dizusobisubinapuzevexi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704f9e7e255---wemadivetipifobefunaw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39d86a320---gorivejosupojibisegazel.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jozupegozonakovirosikaj.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608484adb7109---43707527507.pdfIn PDF document text
    • https://posh.hr/files/minuxavow.pdfIn PDF document text
    • https://renault-service.com/userfiles/nogateba.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ejrsdnevp6vurgah55m5k55d2b/2196519063.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744925072b0---wegizemofirujosin.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/31618403425.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e2dfb04a0b28417ed210c3eee5fa024f/34678922529.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kusovavetaji.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afe632ac7---jibozazegupojewev.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bef882cb05a4c1da6a213f844515246f/pixexowojirupemijumin.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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16268 bytes
SHA-256: 3c551a254bfb5a6b5aeaa2eea2b1636026647668d13c1abcbc0dd1f45067ef43
font_01_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10588 bytes
SHA-256: 61f4cf15cebe76c6dee30523c6bf0b665941094853b7656b88f1527cd1a26f26
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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