Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c532f55887e77f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 07:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79d402a13223aa6aa54a913f832f1dc0 SHA-1: 948fab0684080af404298f14607986cee343ffa8 SHA-256: 96c532f55887e77f01c68a44dd4e71e25f214fd8b4d509f5cabaee57e6886034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the attack pattern of using the PDF to drive traffic to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://archism.ru/uplcv?utm_term=pdf+parenting+styles PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4700093f8---46286946744.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/85635154924.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/16246440899.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bipejijijuwokalanalowe.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/23645215031.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95543169611.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b925cab547---66519675439.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076965994768---89359192580.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe227588271fc3212c5e9619495348aa/ripuletateze.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/kexizigofasasonagu.pdfIn PDF document text
    • http://cmtsport.com/pliki/vuwuxazikesanafewunisi.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/wefibafoxomaw.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/91541898112.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/88101524553.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/solatutojagesusufel.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/makibokidineru.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfa31b9264---nipizelizoruxulebazuxi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/43841680328.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7976fd0---16648368013.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///2021831349452433.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9463e8e5---2985384115.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9893f13400---29744255499.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n2okv3v5lgeen3r748vcdtlim0/90062720064.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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 17484 bytes
SHA-256: 256c25f12c60d2b5e62cb9c528032a65ff5e1d2d6a7aa2606e9b63b23a53c25a
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 10668 bytes
SHA-256: caa1bf6adf6a5be656ab055163ff4c942ed2303a60f7c6fde1c9c309dbdb889f

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