Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bb296daff330e7…

MALICIOUS

PDF

79.2 KB Created: 2021-08-16 05:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f8948c83455687850dfb5d0c25cae04 SHA-1: 1e41d334e05c4a3371f253becfab3a2d9c1dde45 SHA-256: e8bb296daff330e72dfd96f3099905e3fd2c2fc2e5eebb12b181990a1982cc7a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple compromised CMS upload links and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5955ebb66---29540119328.pdf In PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mijisejojijixorisimo.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/15811975173.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/xerulivu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161010a766db71---wosefexusosetuvabe.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/futelef.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/nenozovuxa.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/88d1c5dd5b70acaa2dd762a4a3da6b8a/51993375319.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/10013710006.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26846f797---lezemonetadanolaxes.pdfIn PDF document text
    • http://accronline.com/userfiles/file/figijonezezagugonozekeruw.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xekogamedebezi.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kekubebadivenatatun.pdfIn PDF document text
    • https://paperland.bg/uploads/file/90935291562.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94dc938f2.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c1a03c3cc---13405441840.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/dusodix.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4bed09e6b6fab49960a30fd6dc7296f2/46709425333.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kidasiwubimix.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/45334919235.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a12a5ce39---88712589612.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/lagomutefada.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fubimipumizajuxodujulobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2d+and+3d+shapes+activities+year+1PDF 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_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16664 bytes
SHA-256: 6fa054f119def6c413ae26e1102c47c913ce74e56a5a0df9450f87455b74a933
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10872 bytes
SHA-256: 19e873c62bc0754cc5c1a2412197f365be6be85e6b96637adfb9887d8bf9fafb