Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe4439a5d98e101…

MALICIOUS

PDF

107.7 KB Created: 2021-06-09 19:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d776b5f9d4272168c2b9f2ff4bc0999f SHA-1: 2fc3fa153b3546f03605eb51b246337312772435 SHA-256: 1fe4439a5d98e1019d85992b9d619bbd3a91d9eb18e07d384a14d6302443274a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8764

Heuristics 4

  • 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
  • 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://archism.ru/uplcv?utm_term=driverpack+solution+offline+compressed PDF link annotation
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94889ab589---lisiguvugipajitod.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/44852446268.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16075d72fc9b7d---lozixebuvorixupemiwumobat.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944dcd6fbe1---48820664692.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0a062095---rewikabedigupamonepivonol.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ceb63267e---66665747440.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e62a438a---wefojifomojovara.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160767ab88a823---nafezixerazibuxuxevedug.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4c29c8e375ce02edc28b3f7041d89ee5/89396379895.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7085d9854fdfc59b9bb3efe69be03953/52945499053.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c46e76c19d6066817eb97c11e5ae4986/kanaxorutexaserazun.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083264ce26a1---pulubiguxasasiwo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a668a3bf2e5---lajilu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/31715285246.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/k240ugdbh2n7e5b6gk8uqgi5di/tijadulebobisifipise.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91aad1b47---kosefefafabivibo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14848fd17---83728331985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A9 5424 bytes
SHA-256: 32db12e33f24829b2bb738628b80f6af45481253eab9064e483b6f8c3e9c7e17
font_01_sfnt_off00018915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18915 13524 bytes
SHA-256: 00c2141df6edbeff2e8f3577d06cc4e1b60d5eada0cc2f311ea5c6e8ed2d5225

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