Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfadbc678bebc23b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 22:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 318261700363659e43c374b4433628ab SHA-1: 37204cbc20a55c1781812735486ee720f52dee91 SHA-256: bfadbc678bebc23b6d1ab2eea9d8ef4bcf60af684e2b768c81e3034417b7ea9b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a005ed312d8---bizazu.pdf In PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/supagarubenanaz.pdfIn PDF document text
    • http://herve-coiffure.ci/files/56761968789.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/87217141616.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/88503872371.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/47029212308.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160945952a28a7---werenewor.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30ac26dab6---rajiratixusu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bff0406edba7a98800c7e22bf2d2bd90/gutovamudezafonebefopa.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d45c87c51---zasorasuxu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607056ed23a9b---tagaxezubobuvalivuzozefim.pdfIn PDF document text
    • http://ruihuitax.com/files/file/91282333779.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea6833977---23075277081.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13072709435.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/9850847465.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/javazoputewifesoxupalago.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/96068462370.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021072809025773499.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160752d86f405a---galazizow.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/24560264541.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/25266621778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=resistive+potentiometer+pdfPDF 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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 10560 bytes
SHA-256: 53321a1453c58a4c88beb85058720b68201b297abd9860ccba1cf745db3ca611
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 17532 bytes
SHA-256: 688d78d56bb65dbc143430c781266ba9c674af5080fb19f28adc0b6b5b56e276

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