Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae691729d2a852c…

MALICIOUS

PDF

77.2 KB Created: 2021-10-05 01:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d0e50eb387c18aa26d2e4065e731aae1 SHA-1: b52d6562d66ece7f90aa2b9c78a855021ee16177 SHA-256: 8ae691729d2a852cfab951aa76a9184487d7a92cd3f4bc342bddbdc80f6fc647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features multiple external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://herve-coiffure.ci/files/19862466873.pdf In PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/69140431712.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/subiji.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/38711845846.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad3b676f54---rodaxax.pdfIn PDF document text
    • http://erictex.com/ufiles/files/rozavi.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/kagagibuwetibedulubepop.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613386117e207---7641986155.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/17955645589.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/givojamitenirugusuli.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/jitab.pdfIn PDF document text
    • http://decorstore.eu/upload/file/vebakapugoz.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/86428413476.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/35307718249.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/16296872148.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc7106a2c---joraberor.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/1640370837.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20211004_154927.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/nafimoda.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/moduvudanarerazinum.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/dosekodudodonitinularudo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8f090fb2f24c2276add462d7569ceb05/fuvonifaj.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/tebibosowi.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/vadesarozutogipudozunog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=write+down+the+chemical+formulaPDF 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_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 20048 bytes
SHA-256: 9cb477d28b8f779d7aafee022888576456ccbd616547fb32406634a02d791123
font_02_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 10752 bytes
SHA-256: a369dd92124fe742cbfc5e866b0dcce6e6de1baba54fa56302f950ddbe0f503f

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