Malicious PDF — malware analysis report

Static analysis result for SHA-256 2234e90da7fe1604…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4ed7b3f2bbf1eee36ed9f942b811f20 SHA-1: d5591a14968df3affb091912cd7a7429002da69f SHA-256: 2234e90da7fe1604ba7e4b757251d04262354e3cdecaead5f6457633bff18913
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91ba8e54---70375041520.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee0bbb79d---xawebopiwararew.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a5be751edcf3675b0e4a3d51d88a9645/xupiwiwizikoluxol.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/suwifapen.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/renolekusabokasozuwow.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/27772668001.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/difuzesibiwiwozuk.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/bewututofuduzamu.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/8138685257.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/sogetajapizukibob.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/14620638391.pdfIn PDF document text
    • https://kham.vn/userfiles/file/febajexanora.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dhoc502anjmh4m926f847183cf/dugedaso.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/5um4abcktu49vsda6kd12i498k/28649967177.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564af14439---pazawimesixuxe.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce5b7f69c---69257194880.pdfIn PDF document text
    • https://codecs.roimages/file/92353499415.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/27691645522.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/63141106039.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16af853ae1---35934586905.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b81bc54c2---nejetenedifuvijewuxivofap.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607825c396604---49145662579.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/88374059381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aptitude+test+questions+and+answers+pdf+in+tamilPDF 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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 20100 bytes
SHA-256: a3e8f9c52b1fdec9e1891a5637ef247dedbfe3eff1bcf4c9effb0b3f48f989e2
font_01_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 10972 bytes
SHA-256: 182f8b5cbdda8ed2182396a1265246458b3b7a2039f9ff4297452cb656126eea
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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