Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d6d29093c85268…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 09:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34660657614968b248affbf48cfb79f3 SHA-1: e845bad1a78edf2fa3698018512a556803c81cac SHA-256: 25d6d29093c85268bfb6cf2c618bb8d8aa8ca56296590a149c13ca9c9431ff94
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://felicitareonline.ro/ckfinder/userfiles/files/76917701303.pdf In PDF document text
    • https://sushixusa.com/userfiles/files/raragunodesijateriwomo.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/gusaxeta.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/rowojofepakaxona.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nojijarutivuzotu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1cgbshu0dn3t7ece4pkh9cgd78/wuzomijejo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xarewawinezigexojazowowe.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/88404681980.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/rinesevepaxuxanofadojer.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6574662471.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/1897729509.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/rosagifumejozese.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/86924856065.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/92184216433.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/46666114919.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/10045467088.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/01e1defe10f2245f4215c521adfac1d8/bulomadirilaribukemusonav.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/lurarog.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/nukajezoga.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/23033817303.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/rusobutevow.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6f7m8h5752dro4j8ojfs7q4704/digitav.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/11331151786.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/fosisudabemigufitiw.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/fijisavotuweniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+cleo+masterPDF 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 10524 bytes
SHA-256: b07090f8517c1b84c5d914562eec15a72bf5473724df47af6c8e6439d1ae0f6b
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 18348 bytes
SHA-256: f9df0dbee5dac25267c16d60b3a7eeb56a0f5d1e50c64b34207f2e9d477c68ac
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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