Malicious PDF — malware analysis report

Static analysis result for SHA-256 9374e989ad1414cc…

MALICIOUS

PDF

103.1 KB Created: 2021-06-30 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5cd06629d8a2a9535554faf41bbcbf9e SHA-1: a21eaf01bdafd23eedf67e580ece65420d2274c3 SHA-256: 9374e989ad1414cca5ff294c371ac62f651144efd150f2443006439a628bfb8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. While no scripts were explicitly extracted, the nature of the link farm suggests it is intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dynasty888.com/image/files/20210623_141328.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/m16vpbuet6bk0qncjbdnb2r212/95904588749.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607faebe30368---16214481550.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079529959700---merudugajujoburuwedibu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2b2a69e3---31349691789.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84dac0fa7b---siwetesasina.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b594896cb---86763925781.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb19f7c9c61---zexigirazovebog.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/70378679757.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160873bca317d1---jukol.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c09d00b9fcd27a5ad201abba78e3a13f/lagaxudivaziso.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b3cc3a487804ac68767a5f6dbe271ff8/8754583630.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/ratevubile.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/liponetex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608769ac08a9f---xiropazixulevuvubusexofim.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/94a35a840dcb254779046fde66a85c06/76230358275.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210630_234644.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97581947d---37297696918.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/mipobukivoxuretesowumopiz.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/61635209764.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/044b34447910f86ea8c451254e087bf1/movetawafukirazedulatesub.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/71168392310.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/kazebegobigaraxib.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3badafc1c---21318404527.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dece22a70e---fafox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+king%27s+daughter+boutiquePDF 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_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 17752 bytes
SHA-256: dcb16609ff231c6a9cbd39ae641b57c95f5f57e2c203e87ee723475ab1798d1b
font_01_sfnt_off00015e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001763d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763D 10956 bytes
SHA-256: 64ea87c64f97623723c4e3b9ee97c3366d83605e114c0c38f579838addabdffe