Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9e6da0e3bae198…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 08:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 534c9d0f3e65084f7033dbf6f40eddef SHA-1: aedf0055263d285ff9c025fa247e1b0130face90 SHA-256: ce9e6da0e3bae198e9f76082a490804d5606f90c490d71fb9559dcc341fdd177
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c71f0097---mosefadat.pdf In PDF document text
    • https://thomsonindia.com/userfiles/files/dobawaruguwalim.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/72087163708.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/96752926174.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/92921891955.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/toduto.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/rilil.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/35382070639.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/21805212972.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/20449703636.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/manikepaf.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/88591349400.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/sogaloxopodo.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/gajiwar.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161407ab5a1d9a---miwakakorakotubekat.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/46799542852.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/2904372863.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/87459555218.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7umpopgbvphi2t9hdtokfvicjb/bulanuvofurarugapin.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zuwikufizezasufa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e75f864433---26100515388.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/28387394652.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1358469346e408f048bd12669302a45f/91786542439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=web+app+apkPDF 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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 17372 bytes
SHA-256: eb3e9559edae756e07bbe5efc6bd6ad2ce650b9281785186cf0dd5b194bfacf1
font_02_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 9744 bytes
SHA-256: cdd332d6c7241d64f3a57e3f196606ac5301fdb20e96c58c4a7df6629caa2a60

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