Malicious PDF — malware analysis report

Static analysis result for SHA-256 249914b9a81ab42c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 18:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e164a58c7640bcdc71cd1f49f739c064 SHA-1: 165b1d589e8dd34da7c3c75e8b50a62ce9f36c88 SHA-256: 249914b9a81ab42cd375a67c5561f6d696c6076260470be7f3650842339385d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

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://rabudiagnostic.com/userfiles/files/soburo.pdf In PDF document text
    • http://finara-v.com/file_media/file_image/file/26611773297.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/zuwurene.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/miworot.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/riborozidejinu.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/ferufeduxagokibowawa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53acaba66---77971412667.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/6869610355.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zefovupamaranezuforus.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mugixuko.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/xokejasokewiwa.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/nonuwekakodunadag.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16308892679246.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gagetatukup.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lalikikevonitazadadal.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109060448547480602pz9ywtn348r.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ro53ja799461m09k6v11cssjiq/zawidabefax.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421b5684a8---zebilolamojikax.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/zedanabobubo.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/navezerukikededir.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bitoxolitekewedageber.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9c500940---kapatomewiriwituxopafos.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109012159001683.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/33142392823.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/41119746186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+bass+boosterPDF 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_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 10316 bytes
SHA-256: fa2963d42e38fb5f92719c1719fefeaec0fe8c1140d79f39c263e84959ed0e61
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 20456 bytes
SHA-256: c3dbb5e2e32fe094dcfb66a023480042b4f3226a97c703278750af9f50b7c9b4
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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