Malicious PDF — malware analysis report

Static analysis result for SHA-256 e945c22d253b95dd…

MALICIOUS

PDF

81.4 KB Created: 2021-08-19 17:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 739ea50b2931fad2842c9d03be28a2fa SHA-1: e9b77bdb9ead1c196b5223a18eeaab112200ed36 SHA-256: e945c22d253b95dd361be95a5e7f3fbafb73e4e64c1497884040febb91c58f9a
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, impersonating cloud file-sharing services to trick users into clicking embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=weathering+with+you+watch+online+eng+sub+google+drive, likely lead to further stages of the attack, such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://laborke.ru/uplcv?utm_term=weathering+with+you+watch+online+eng+sub+google+drive PDF link annotation
    • http://vimbark.sk/editor_uploads/files/59289418776.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nunotazabiv.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3a64842bf1599f0efac63013c93b0dbc/disuwapipewutuxuwovuzoxo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/33b49f97106ac53d9436c03ec2374217/925117693.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/japirimugobixodilitul.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/64543341765.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe1f1a76d---volekidolon.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd035ae6094---retukin.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/54390396259.pdfIn PDF document text
    • http://ruihuitax.com/files/file/56409128156.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161148a85438d5---32203855313.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/68023532032.pdfIn PDF document text
    • http://klpa.net/userData/board/file/74705905781.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/susixetizuwudozuna.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/bepenejovix.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42b1141dd---gesizuji.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rjhou9bldnegn2i9sn5kp4ui8c/44841254546.pdfIn PDF document text
    • https://norservis.info/files/files/85876769107.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fb787e963---28247607831.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zosubijoxugobudej.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/eeb71653b43e2b00e820436a3a872317/83161103460.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/segoxiwugajur.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/91526774639.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad31620a5d---jidafivoretijukek.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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16464 bytes
SHA-256: f2fc8b76e6d2c58429d3450735943b17513e79766bacdc63e120ad3cdc5a6595
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 11148 bytes
SHA-256: a69c57fc7a0392037972fe04a16f3b400d52595514b2c32c5c6b1f74042636bc