Malicious PDF — malware analysis report

Static analysis result for SHA-256 1194e81ded1ba470…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 15:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db98f994025207d1aeb87f28ee08fc42 SHA-1: d98afb8b990e8ca6eb890115fa1338ea6cc62547 SHA-256: 1194e81ded1ba47044d80819cccf2d4daa8e67f3a30179aebc0898259ccbd656
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, including WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms points towards an attempt to redirect users to potentially harmful sites.

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://crysiq.ru/uplcv?utm_term=index+of+prison+break+s05 PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613261304d194---poxaxomave.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dakifubuzaze.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sumuti.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/53207787158.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/jevuz.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b37727f3---piroxaxunekopilup.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/61634625496.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82488103039.pdfIn PDF document text
    • http://amkchem.com/upload/files/rulisiv.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/34616924169.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ec54248c80022c313f8105ab0856ed6c/gitakavolakuzudusovakuw.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://webminmax.com/userfiles/file/61980783486.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/noxipi.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/fiwudubarafuwewox.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614508224043e---gajemobirenatipudiwiwi.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/23528466620.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qkgbcpusrijbjhmfho32o2v8h6/97690448844.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d088891235---52403003088.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/zimavolo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/4uuc065phbeorf6brphekp7338/80288392522.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nb0i9n58phkvg6t7bnp5dda1ms/polofogo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mosupesuwakis.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614461fa382e7---42283653073.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/panidajovar.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/32684825357.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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 17588 bytes
SHA-256: e0dd69396e58e9fbd8d5f153cc3ba7ff860a2eb7795147f5ab6e00928df52c4b
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 10888 bytes
SHA-256: ddfaf93cfeb47aa8ea092f74fa1da7a10e3fd7b4d0d8a13514034f746af80977

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