Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d6e39323544a59…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 15:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acf91d07c5b641bd5873d88663e4737d SHA-1: 8b5fe8f63ff5a27b90baa82de7e411c9b5364293 SHA-256: c8d6e39323544a5921b4d488f0118b1d3cfb6bcd1edc2be195e6925aeba658e3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for SEO manipulation or to host malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c0a6d970365a901527ee76393eff7de7/kuwajo.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e0e39c25b650bbad64750c30b2d2513d/48115511663.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa7db2b97---25763118780.pdf
    • http://maility.pl/_ADRESuserfiles/file/54079127090.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1087c51a---5701509037.pdf
    • http://marthomaiticherukole.com/userfiles/file/23631889726.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf84646892---gazodupopusufipubuven.pdf
    • http://0851gay.org/userfiles/202106file/2021061721525870554.pdf
    • https://baptistfriends.org/media/59298864826.pdf
    • http://soldearenales.com/galeria/files/tejakizu.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/56ac53f18479b5ba90eb162e2619487c/tarizegadapo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed2e2f451---14114269926.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/desiduvifujufoj.pdf
    • http://airfa.it/userfiles/file/taxugotapekifal.pdf
    • http://jiuxingchaoshi.com/uploads/file/18031304369.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6fef6ac08293296b272d8ab8d572c0b3/xuzazoxarevejulorufajinug.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/63075496323.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s1qu3k657bcapvaihh09u0dap1/11960439489.pdf
    • https://aluminiosarla.com/userfiles_arla/files/bivutoxukigogapuwanej.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fa4n4s9r1opbtrbabtp0f28m83/46901906197.pdf
    • http://nage-z.com/ckfinder/userfiles/files/85543355353.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c02d33328---wurefaje.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724506d9d1d---gidivenizu.pdf
    • https://cmsschoolkg.org/userfiles/file/55936837811.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=class+10+economics+chapter+2+development+mcq+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 16792 bytes
font_01_sfnt_off000100dd.bin
4b9bb0802746505ce76caaf6fb074864678aaceac2b3df449c77d3937539cf2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 17356 bytes
font_02_sfnt_off00012e51.bin
6ae95f84d247b1e8206ecb237b93eb3bc455c90ce796c73432f5ee0816dfecd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 11400 bytes