Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca13c40d200996…

MALICIOUS

PDF

77.6 KB Created: 2021-07-24 15:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a785aa4e17f5b1c4fa253d2cadca38f SHA-1: a1d62b57fc51c6e91e7faea2c26edce97d847775 SHA-256: cbca13c40d20099633015c244153b5445f349c577c36c6134fbc75df1b83859d
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7569

Heuristics 5

  • 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
  • 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://observatoire-omic.org/documents/file/56094643928.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8bec9e1be0e684e7c50fb8e4cd3dc574/tazitupijeforewad.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63e92e4a77---30352939912.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ff34f72f---sajixitetitazimabu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/38361074634.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xagoza.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/kelefexuponozagenizusam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da48bccbb---gipiwubil.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16a463e215cd3d091f8bcec439a59548/mesasivutikup.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f02aea866---27122079616.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tu3sfclr5nu5vc1e93iftet19e/81302298191.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/voneludekej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828c5ef359---kitagijalufiwo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d28d91caf---74060855624.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sv5gn2om9k41nbdcroe9bq19m1/tapobixemoxefaf.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/duwegipavajo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/65618684074.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/36313885324.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df37ad0a7cf---64627447867.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/23755892201.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/50190098899.pdfIn PDF document text
    • http://mebco.ru/images/file/savujuvipolirobob.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/vowira.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d994893b85e---48723364313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=citrus+anime+season+2+release+datePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 17492 bytes
SHA-256: 9bccf0980b21d564f575689e8c5505f160b35379a36d5b13ba308c724ecf3eae

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