Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2621607489f27f…

MALICIOUS

PDF

101.5 KB Created: 2021-08-20 23:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06d8b17eb2ccfb0019157fdbfb697d12 SHA-1: 7cf4ba2bcaa1fbfb9faec8c4656fbc27800b9f7a SHA-256: 4d2621607489f27f154caa0ccd2ad846e30a9079134b3094f30dc8b1bf1eae7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirectors, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2c9d02c037864f65841cee2d4b645147/noxuzaguz.pdf In PDF document text
    • http://studioaba.net/userfiles/files/7431325424.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/57344212968.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9atncrvq6jkd5qiqtstq8q7h33/99745867237.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///56344721229.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t9dnu28k0qt5akkm5dq2boh8a6/97930884682.pdfIn PDF document text
    • https://le27.fr/docs/file/ridodigojogiv.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/38802450273.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c261ec49cb9---wefoz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rbqij2h0ic76q5kjn87mtmn5a2/87781210456.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/fopaxuvugarowezajanuva.pdfIn PDF document text
    • https://cargotavio.ru/files/file/ladigaxiz.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/79724676780.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d259ec1b---46527773703.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/kowirekifawewetuto.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/difexekalibeteguso.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5821e4fd40---kiwafefofudeturepot.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/tijujujijidaku.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/r3k2hk1hdt1b45uur58qub5ub7/16824325781.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zedunolojufigotavovore.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/nibaj.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/79748886219.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/dudigevoxakefutadifiper.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2851358d6---67844930816.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/96639453151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=scrabble+gratuit+a+telecharger+en+fran%C3%A7ais+pour+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 11412 bytes
SHA-256: 43735b1ad9c0c1d288d3b31c4e9ef3d50a16cda6570bdf9471587979a8305b53
font_01_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF7 18832 bytes
SHA-256: ce066d3b1e46512ab88a3624830afe1b8561a5a532e0a2a5ef5d98ad8c6127d5
font_03_sfnt_off00017b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B42 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24