Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b72c3ad21f2ca21…

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 10:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e311c9c6500c436edefd8d36c6dc58be SHA-1: f91339a83fa1c207a2d6bc05466524837d544c7a SHA-256: 6b72c3ad21f2ca21e063bf625e7c0f8c734456a27f064227411a70206ecf1389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mmtours.si/uploads/81648133211.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/72684571146.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/munakasupifofel.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf4a71024---giboboxitamefadosetop.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/repuxetamogu.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/gusameligizijudagijujofol.pdfIn PDF document text
    • http://cascad-trans.ru/files/88777112120.pdfIn PDF document text
    • http://gewald.ru/content/Files/8515095329.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m931vpkooht2u4ndt48g3pj6i2/3418619675.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/wefevibukulelepute.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/luvedawin.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/fibugirabisusarero.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/tozixofarinuvu.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/fevevu.pdfIn PDF document text
    • http://mc-opony.pl/files/file/senobawolodafi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e7e947344765d0ffd12ac2aec5b0aee3/23160788818.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zisoxitupov.pdfIn PDF document text
    • https://mkontroll.hu/File/mozuxuj.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2d915646---61531090810.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jonide.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/tivabinavoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=java+mvvm+examplePDF 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_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 19852 bytes
SHA-256: 412abfd07c15b76c7226bb9e5ecd98ceaeaa832c34c8f3f3440825c34c22d9ed
font_02_sfnt_off00014159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14159 9892 bytes
SHA-256: 8e68d19819ac13a7df496be948207a7b280776c4e4837ba01b7bda5eecc3dc20