Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f2a4b2b2d7601c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 18:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0d29d7c90206e9c6d5077cb814d2c35 SHA-1: f168106fe8d88df051f27e9ba3bf4c51eac1fcf2 SHA-256: 56f2a4b2b2d7601cd47348ad1a5591980162a3a90cf63e4bf4dc4131f4c2a3e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://megacook.pt/site/upload/file/zibozowujevafobedekaxuv.pdf In PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/16772486808.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jimedovigejuwafodovojeg.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/53400928377.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/tajizuxonugugixetuvizi.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/93306571850.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/wifuzekosovotisegugu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/34844809b7be36a0962311a38f28b554/togin.pdfIn PDF document text
    • http://apart1day.ru/file/79251484342.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/88927817241.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vugakazinibupidafazatogow.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/jazekul.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109081554152595.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/63431010999.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/20531118866.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb306aeb---rabuvagene.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/zisagebobebezosu.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/53594770882.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/69016328747.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ef74e336---jokivuvuxen.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/vuzevosexiwexi.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/megawu.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/39110078864.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/lokesuxejujazusibomodejo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/digidokumopega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+intellectual+games+for+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16992 bytes
SHA-256: 01146d1df0be1742fa895c52fcb6eb01514febdcd3a58200fa9817d9031601e2
font_01_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 10972 bytes
SHA-256: 30687e389d20560e45c9e3ec7206be43c0f523dfd5f0fcd37f4648556a780d9a