Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f2c84d873ae341…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 07:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50fa6ec915b2091343a574fe7499f136 SHA-1: 792e47a0d3a961d925c32d132d39c13925990e16 SHA-256: f9f2c84d873ae3418a7006d989daf11613ff252e09e98199facfab68b3d3b5b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised websites, likely designed to trick users into downloading a secondary payload. The presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/19f06a68a0bcfa0d77b0b8d09dc89158/60648536000.pdf In PDF document text
    • https://yenhuy.vn/upload/files/sanenexododevafefenaru.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/37380554665.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/odlknknhh2gq67g4vgkl3sc1et/34813556454.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/dtqqni0rfh3347vfcohjjv1gib/rebowalixilamofewudaxuzuk.pdfIn PDF document text
    • http://epicridesnepal.com/files/34312560591.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d24b108cd---37856996757.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ab4dc085---61541073266.pdfIn PDF document text
    • https://bselink.com/userfiles/file/21531110423.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/4254065697.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097c6c21d392---68830502967.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/95780978631.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/ac1c9186178f57a2754c921aa10fbc3a/fagisefodi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b68042032---boxifalofo.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/giwosepuwogolakunevog.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/kutabafosofatekivikoxa.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/kasijelijomadawijinugoniz.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tekabu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///22478420802.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/tuxaboxivutugem.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nuoeo2kd972eahfvks1oggqibv/popeseganefinuxuzowa.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/domizadakan.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/84169997558.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0706/4abdc5b2975ec7819f0c76ce2994feac.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5e9cfc831ef3269585cc25937816769f/18796812199.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/12b33d77d5c2a6f68c04d9176fa531d7/jevat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=skyrim+5+license+keyPDF 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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10428 bytes
SHA-256: acce4a58cfc30f80ecf1b84c0b37c09a5db9399a60d1c84170183f502072f5bf
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 17256 bytes
SHA-256: bd687759c42c5fbc28fd34b640c0495444f00e6b4c857371035a063fefaaab63