Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fd8c915d2c98b8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 02:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cca6bf9a12bac62f422c187e9d162e96 SHA-1: 50045bf3cdae9c8da81f09d227c8f24561511db7 SHA-256: b5fd8c915d2c98b8d06fd578736aa33cb0fcc8136239da6ee06dbc08f72a3dcd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Numerous embedded URLs, including those pointing to compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nawaasha.org/userfiles/file/81621945234.pdf In PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/96994963782.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/1533813016.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c06becddcb0---72403552451.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/vugarirenamolunefa.pdfIn PDF document text
    • https://soechi.id/userfiles/file/45692542637.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/3512390141.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a1520d315fb---meniveki.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/xosorogatigepuguluwisik.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16105f0d1ae12a---tuteximeg.pdfPDF link annotation
    • http://fw-simple.com/uploads/files/xoxemudog.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b2d8e087---21666990881.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/28649152603.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/62420402257.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/76927466785.pdfIn PDF document text
    • http://billsky.ee/files/file/juvuni.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607feab269527---magenazikezitiriduta.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/64ktkmtfts1j3pfkb02u9pt6t6/logegapifofefarumosijubo.pdfIn PDF document text
    • http://kahasat.cz/data/file/23392049474.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/72468769495.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/fexuwuxo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/04ee8d4c4f9ddfb5e7fca664ad4120c4/80823431550.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819abf3a0c6---38635709587.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/06579d04e9404f5e4629bd13db0704e3/94358344431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=peugeot+206+cc+workshop+manualPDF 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_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 18344 bytes
SHA-256: e2407665f4d32b79b6cacd4adfbc89d5e5bb346f43db93b149769d10cc2c6166
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 11420 bytes
SHA-256: 4a92d43b5f222b6ef0ff9bbbfcb136d11f7f0eb577bc9d8927d07047a2221d09