Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23c4ba5e211df5c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 06:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d2721e831068b2a47b64dac3b2db096 SHA-1: af5a46caacb44e7cbc25c855b8f7687ddbbb5bdf SHA-256: a23c4ba5e211df5ce5e267ccf027246e69772c15b266ab170de415a2c84a3415
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://anthonygillant.com/userfiles/file/jadewogukorawovufi.pdf In PDF document text
    • https://campermagazine.tv/public/file/47627788197.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/23207562901.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nenud.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/troju9487019grffocs4gqgago/89210819491.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sikukomadut.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1127ce0e9---87636779560.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/65831554239.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2df7acb04---62952519659.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/dibumutopumerikikapanarud.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b763944c594---moxikegibekelijux.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/81f14cd2f01f0b04d07fb8cd9bfd3602/59405072961.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/47241774196.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/bufijuz.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/81342680540.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/rivutoru.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/jigikefejobutokaxifebuno.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c25713639c5---1276766861.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a17eab9a1fb600139074f4817083a95/tirudaguwujonedevagutaz.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/witodonuw.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/separedegovajirirakos.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d997e5ad---43518038591.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/78598115726.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/vugigidetipajilaviru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tn+police+book+pdf+downloadPDF 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10528 bytes
SHA-256: fcc109f21ec8f60c6981be46cc1ffad16139aa2cd5f41734e4304d4d438a020f
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 20532 bytes
SHA-256: eb5e0b920fe30c1bf2f7f4fe8d026c7d957872548bc23babc078fd84d2bf2c4f