Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bd7dc96849a487…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 11:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2ca2da5e6180eaecc14f5654023f338 SHA-1: 61b962c350b8aa6867af3107d3c3e73ddb586315 SHA-256: 87bd7dc96849a4878e4f6f716605c332289441e372725cee73477b63437b869d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links likely serve as a link farm designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=protime+test+high PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe010b5165---kojokajewikemuxij.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbe261f0eb---46818024374.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/10151261663.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/41244797297.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5887c94c1---kasazikekaxekuzinenipejas.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/woduladax.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/53367952140.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wutoxotivezokefuguraram.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/thaf9jvirtqcuc9tfqi83o22e9/46624678007.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b630cd7c382---vegepenidatuf.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/20559420299.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/37776070496.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/virofefojolefex.pdfIn PDF document text
    • http://aurora-c.jp/files/files/92340101159.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/67114242835.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/95236351656.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107092029538084.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210823_0296026F4607A5A8.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/nesodufozulowarimikunum.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/50431672825.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f1399b41---25212846063.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf366138c2---nolifomulibuninosixe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102cf772c812---xolalogotavatemorixo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8e85b8886d001cd3f8286937e069a238/timeguzanibunufozajog.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e17cf12f9c4c94d8b3751206d0be152e/virosovexab.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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17716 bytes
SHA-256: 0575ef5242ac650b75018b78e3b766be18b88dad3f258e799f86216e8a622f3b
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10244 bytes
SHA-256: 64a3cd9e68d5b602d011a95ef7f2045513c7ea8c8e3ee2ea160148bbc8baaa8c

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