Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d44dd647230a43…

MALICIOUS

PDF

82.8 KB Created: 2021-08-29 01:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fdd02e1ab181a0deebc46c63039aed3 SHA-1: 02bf28c517cbbabac0ceb329fe320c79a8c8ea6e SHA-256: 21d44dd647230a43dcd0fb0eda39e4c9a23bf1459f26790c2525e18968dcfc46
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=necron+dynasties+9th+edition PDF link annotation
    • http://thetsaban3watnuea.com/UserFiles/file/36284059418.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab87c42aacd---gariwewe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce2faf49c---vodudegepadapavetu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/fufibaga.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/83c2448e4aa3a93f89bc24212b1f754b/gexumuwuwipibuseludufo.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/39257348851.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/49411166761.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fe5ae309---64628345807.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a7e2a6856f614ee27403d91555f5d27a/divodufutakonebelase.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e39098b0---nelofukawuso.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6401cc1871d74d18dcb680ba4f0c4dac/44634883041.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/21524437629.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/waxejaku.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/94730811827.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c6f9f1d66---panes.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/49829304851.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc164e9e3e---dagupukuwujajopilepom.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f2d3c5b150f39b694c69b9a6e2a0d395/25729790172.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a964a1392---xudamef.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5e66bb5fcaaec51026f4c53d806e811b/45070051327.pdfIn PDF document text
    • http://indemo.pl/Image/files/gelip.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e486ee15d---wemutesegeperawefej.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/72b5a2d6e4cb32c465222ac00cc39c75/pipad.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10680 bytes
SHA-256: 7691722d4ef5dac34e9379fb3812c643fc53683dd242fe4c83620ac2cd60bf51
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 17268 bytes
SHA-256: 71895f556b90389403d1f634ec59f4ed57c22726438530d27aaad0b32811eaaa
font_02_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.