Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d6cb18bfdb9007…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 17:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0303a0f41f6421a16ee9b29bfb8dde69 SHA-1: b3f5fe06a560970df6c29b7d1d36811a97a65d1a SHA-256: e1d6cb18bfdb9007f7bda19a5e413a9f7a18e9f6bb9d5628f53c7084b19c6948
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://tubesealer.com/uploaded/file/9132852166137d0f5abe7c.pdf In PDF document text
    • http://valsadindustries.com/userfiles/file/migibitegabupotobubufado.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/68467620842.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/jifexonajasesipomavamesa.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sububizixutoxiwax.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/9134110406.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/sekusagosenunuwadoj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f9d72fb22b254754bb8aeffc4d055ba8/zuzufifego.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/75551317445.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/49233046191.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/poriziximagagakowupi.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/3031154.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/visariditoxogivutebuneve.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0663f65a083ad1a839b20c095cc088e7/xupulowekuveramatadabo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a0597f5c---23323719279.pdfIn PDF document text
    • http://okvin.org/userfiles/file/dasutipesun.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/pogefezafotonexikewidukad.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lanimer.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613575809a464---sepabisisoru.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/wabuwomobev.pdfIn PDF document text
    • http://leguido.net/files/12394483518.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613835c82562f---zoxitipogatatolidotufiw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0324f25fc6f5f1b55cfb5fd673c22501/18165507548.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/niriwezi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/gejoleloxidebivaxofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+get+new+emojis+on+my+samsung+phonePDF 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 11112 bytes
SHA-256: c70883a6c97b5642c29c6f3eff7639a41d32d272faad77920eb457ab7f9daaf4
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 18708 bytes
SHA-256: 29e85aefe63f27fa1fa7fe57eafdf8b84e8c3a46dbfef65301f4e009b5fe7810
font_02_sfnt_off0001351a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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