Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d544d336fa10b87…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 22:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72c2222ca39c9f28aedc298bf96b767f SHA-1: 0386965815f7aba2494275ab6fcee64b07bce6a1 SHA-256: 7d544d336fa10b87baea8babf0045c5b4613a113d38f906bd3fb3cee9eb168db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to direct users to various external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://archism.ru/uplcv?utm_term=yes+day+movie+watch+online PDF link annotation
    • http://jogagongu.pl/userfiles/file/87582506258.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/95412824825.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/lepuratudunumexo.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/23683455693.pdfIn PDF document text
    • http://www.og2c.com/images/file/zudewe.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c9143abc631ea3db9902176fb4f683b0/nakiwuvuzukatufap.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///65761011963.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/meropubewemenotajekosi.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/43903385130.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/nafonomuxe.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e99a1b34ddea2636e68a0d7100c2bdcd/wamokoma.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/97937724395.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/65216013992.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/kejutipibituxe.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/90491325807.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/12231459163.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/37684132488.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/nikelawepugunavosulameg.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a326f47228---luwoja.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/dolobateza.pdfIn PDF document text
    • https://kenadong.com/contents/files/jevafij.pdfIn PDF document text
    • https://digireg.es/upload/31411103711.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ae708d743e472287cfe3df4bc5cf92f5/buvavozabevixu.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/futati.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/jagukojosevizoko.pdfIn 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://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_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 17200 bytes
SHA-256: 65ba7b58e8362a0453e0f384e06c9e96eb578998785fa86af50b63dfb53aab56
font_02_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10784 bytes
SHA-256: e40fc299ee0b1ae34de2a463212f50739d2db4e53746426c5e6f1594dfccdf0b

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