Malicious PDF — malware analysis report

Static analysis result for SHA-256 398a8d8afc77df51…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 12:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36f6bdb543d338a5ce067a00c6dd68e6 SHA-1: c026ce6ab917f41f1d7cb8078a9419ffa07dcea6 SHA-256: 398a8d8afc77df5167ac84a0e68b6cb247ead10133bd8c748f3adfec1c9e7f93
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal numerous links to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=algebra+formulas+sheet+pdf', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=algebra+formulas+sheet+pdf PDF link annotation
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/rezejaxudeg.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df9cf50586---tenibuletukibevoxuwuton.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/kukedarod.pdfIn PDF document text
    • http://ippon.lv/uploads/File/82662026307.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/81843333567.pdfIn PDF document text
    • http://m2m2design.com/userfiles/37884225816.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/mepezadigabejebopetov.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/logitimerimuzijefid.pdfIn PDF document text
    • http://hasyo.net/files/file/xirevewamajuxozoto.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/karuzexaziwubi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kqbh03dleasfaohv68gkuvfps1/93659430105.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098397798c31---83422585212.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/68104834143.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cpfhfkroatku9uaarglvt2fgd0/kuwuberarevurimosaxijodol.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2a3ac58c---kenupujobawefowupetulofu.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/dutatisefuxenusizot.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kiramadorimoda.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/judin.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/51969868020.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mulitat.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/gexapedozebumejuguvutefo.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mukulegowiwavibokanif.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c6765cee267---vejofajepuvavenane.pdfPDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c21c11d17adf4cabb9b0115c42092d2d/82896516776.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/92074531513.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a70883cb8f0---52436439440.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a9da2fe8---zigekomepusixazexal.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_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 10972 bytes
SHA-256: 298a1a3c894d77d32b029df85383c15c596fcc443fb91a0dcb5beae5700260a6
font_02_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 15956 bytes
SHA-256: b14d191eeff7462dea5023db6f5dd49478aee1f62d078ed708e3f82f3269547d

Open this report in the interactive analyzer, or submit your own file for analysis.