Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a114b4227394ec…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 16:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1745025744d5c7fbd8c5f44b2b32f4c1 SHA-1: 11cb92658df5d7cb72531e056ed1ccbccf2bc561 SHA-256: 73a114b4227394ece0c59e3b9fa9834d260c3053a9509f4b68d7dd36d7e0dbf4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting. This suggests an attempt to lure users to malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/96349065648.pdf In PDF document text
    • http://metalltechnik-kutschi.at/85668153417.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/tojegisujefapavu.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/81465426300.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/wobezet.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d4da3182---pudororo.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/woniba.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cdd63a5ef9cf64efe15b0cae167cbaf3/lefarisavulebijamo.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/82632531627.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/zupej.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/38704580493.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749b48a98---jamewerapapeb.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/48732982029.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/mozedopus.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nuwoguzozaluvivoxeguvum.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/92296073626.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/45929943004.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/viwoxikezisazisiluvawiw.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/zonoziferaka.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/ratilelefikuxofixivabaje.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f72b3274bf937f7a783921a6ccf7eef9/wabutezuzi.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/34298581149.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/pikujoresup.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/76262333097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=seated+theraband+exercises+pdfPDF 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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 17656 bytes
SHA-256: 7c7ee72ed487a16eb963271146dab0abc6773a8d0c8e1b14ad65b3514feac698
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 10868 bytes
SHA-256: 7a06a50c3db1a1ccbe7cfbc0de05261a2c4cf89de6f86002aa6114a6e234518d

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