Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8344fb1286bbce6…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 06:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88596f6baa28036519ef4d492ca60262 SHA-1: 3eeb7c9f1508a7440fa5f039c88eb6a1ce2599e6 SHA-256: e8344fb1286bbce60bfbaa666a00461b226ffc0156ab101840b7f9d3deec6bbb
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document's structure and embedded URLs suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086b68427b2a---19739281047.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b9dd5e84---fosokureseborikofe.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aff080260---jujugonop.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b30474586dc988c96c29efeb83941f9d/746672153.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ff75ba8adcccae9db8f7eeacceb02044/92665878857.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da67a8f31---lowavozorivazida.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607611741a96b---22084900496.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ec48e025b6400a545d2f4e101c84ad42/19556027910.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e8da767f---21540185850.pdf
    • http://1utilaje.ro/mm/file/kamagedunanir.pdf
    • https://burgaseguros.com/userfiles/file/18719339375.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca27e28601---40254512797.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d2ac832c---7028532379.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/12078139683.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984c855ea6d---82282637616.pdf
    • http://cestovni-postylka.eu/userfiles/file/48115600461.pdf
    • https://mayurherbal.com/userfiles/file/84178685493.pdf
    • http://chi-kara.net/userfiles/file/64841839902.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade05b309b6---jereporojuba.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b140b159e22---31744558323.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a9b2f79d974f54a8774396a977779b3b/sokubedalojuzax.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae739867feb---57081726481.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ccea0153e5292f3b382d843e209052eb/fakaleledisufarozele.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/53f0489eb8eed568e005c75f7acd8535/gugutapujelupejumuwukik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hd+anime+streaming+websites
    • 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_off0000fdfb.bin
522df2b5922a6e6bb6a14ebaa6a91b9ab4352c5c57ee819f4e1a688f584bef22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 17068 bytes
font_01_sfnt_off00012a7b.bin
6e1eafbfb544236bf1373be540c0cee8ea01c1997a9d1c603b6945f284c3aff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 10640 bytes
font_02_sfnt_off0001429b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1429B 16792 bytes

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