Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff8f39bc0543294…

MALICIOUS

PDF

96.9 KB Created: 2021-07-05 07:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4363aa461997eaa1a95d8f97bc7865fd SHA-1: a6980c865f84afcd35c7eae3eac25a357b9a3a38 SHA-256: 4ff8f39bc0543294462b2dd3b4713dcf33cc6ac0337db1b4d1ef0e010a253f8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used for phishing or distributing further malware. The document body is unreadable, but the presence of numerous links to potentially compromised sites indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://agatanorek.com/files/file/63540736728.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dq25e5ftfjqtlg8to8g8mp3pnc/famezewekuxaded.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pd4o6qc8na5d3bqduqhb9u8die/18501993112.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160870afc69e8e---piviluvekoxelewazotosexe.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/88103859357.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/eb93aff95a83b06ca26b5a2f66c2d70e/32075516605.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e155639c30---62674888935.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1ecd6920a435a5843d4cd8b2934400a4/8240512695.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6399b9c7a---fukasemukemoz.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/soripumilofipijatosataxad.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mtubb1tp1usmrg7bj5dtubnkfj/33268492472.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1rq9jqmftimpklrcfihuc369r1/93554794864.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/18228298128.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e3eb41c80a1fd1d6e3f54703519f7072/kosavezobukubadal.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f1f915340b5e639ab3ea074034114e84/wikosezej.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/81931736870.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/79795743503.pdfIn PDF document text
    • http://3will.org/soubory/files/kigevigedazitamo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/87452761204.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3f3595cc---19977665580.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/man6glhpjaecns3csgs7ooffa2/61843641591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rational+exponents+mazePDF 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_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16868 bytes
SHA-256: c8783e266952e61383ff76f1d5b54e81324e8541851e5798c07d7076dcc83698
font_01_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 10520 bytes
SHA-256: 40d1fcad6d5a366dbccda1c05e42291ea11002c1ae6d83d823d84906327d8bef
font_02_sfnt_off00015cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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