Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e131d8fc0a52f87…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 23:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df880c52015f48f445d86f15482db117 SHA-1: 0b4e6c52665421ced164f3cffaf6f7031a5c6da4 SHA-256: 2e131d8fc0a52f87d068d6c0f17e29f268ec4778205fc7eae2ddba425eee41c8
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a link farm to obscure the ultimate destination, which is suspected to be a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=john+wick+movie+watch+online+in+tamil PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252cce868d---20509183115.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a286e1198---25122789411.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bizapepedekafek.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4127442431.pdfIn PDF document text
    • http://popeyebio.com/upload/files/39030123406.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/58905214070.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/mijugabagaporidat.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/42625657181.pdfIn PDF document text
    • https://europartner2.pl/uploads/92601599957.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/rapibozunilipepiwoj.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xojuku.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/24809718612.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/mewuwiwedasajexom.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/80007532794.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/latesozepuzirodutigolatoj.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/8760761782.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bde13ad73d---99772260295.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e01bd8948---biwarepotejizumaw.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/sedularakolemetu.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/jozeraburevojujalujepes.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210906050022.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/33385265992.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed01b75356---11338889082.pdfIn PDF document text
    • 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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 20640 bytes
SHA-256: e9ec6e02c26945576e2f437ce0c7e5625682d98eba2328607154dd2fa09b7544
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 10464 bytes
SHA-256: 6eb797f238bf2cf3b6e1f723d090b9084a03cd3ff421877a16fa50a1c3160332

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