Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2d3cb7ec5f2347…

MALICIOUS

PDF

79.3 KB Created: 2021-06-07 16:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8eb19608a4645485e254802bb0f78310 SHA-1: 458b446cfe2416d11da47a72325c3be9b8934c0b SHA-256: 6f2d3cb7ec5f2347ebfffac4306c6b60133e056b7db1042dc3ed6829834798f4
156 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the hosting suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=la+metamorfosis+libro+para+leer PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4377ea938---60823343318.pdfIn PDF document text
    • http://kfbi.ru/content/file/34241966804.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c3a9c4b12d21a9b6150d981935e31785/tosikexurapumawogapofi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609443aeb2565---57607678746.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210516001813187.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609881e28e0bb---27254849530.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080196e7edd6---kojeb.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dde71aa0f---lozuwivokemogivomenapemo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/65318ebca1cbb752bb8e906126b5bcdf/lemoruselabudipemuli.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3075604eb47980bcc2e62bdb54b593d/merasubi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a7632f7ad---11374541000.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37a4487f---96805515717.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3c0151b65ec7917ed36fb599a726ec67/gomufabigibedozimujozixo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/98e830dacd280af45d8a2c71d505fb38/49805379318.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085281ce89de---jofutojowemeseva.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fifajepaxivajivutiva.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/55387935140.pdfIn PDF document text
    • http://topas.lt/userfiles/file/zifurigenolo.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/53639087239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 5128 bytes
SHA-256: 27309e111e31aa9fa1f5192e92c6f612980cfd5ebe1ee19b67bccccba4ec9fec
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 11728 bytes
SHA-256: 57c15c6ba157add088242c28195f02cd147765e38fd0fe1560694726af6078e0
font_02_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 17648 bytes
SHA-256: 8f49ee8483e6d6c0eaaff2bcceacde1d4b39f318765f59a03550474aaba7d322

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