Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94c399a0c54e003…

MALICIOUS

PDF

76.4 KB Created: 2021-08-20 01:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e0845046b1d5a8574a4c3a14887ad588 SHA-1: cb74563dd470c1e0a4559564b71b0c9a2a5386ea SHA-256: a94c399a0c54e003b2b1f42ab5f1046ac823ded169b1a7c97d2f16b4cb7934e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host a large number of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=abc+brainstorming+chart+pdf PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0fu5m4tg1grmkf96rfbuv88ilg/14989199708.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/fagomed.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/n9i68ja1do00fmtqu2onbab404/bezavijasiwirubotukevakir.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/irugnn9evmfe4d168trgetvfgc/gadisudupagelebevagumorik.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/tubexiwuguroradakavaluvas.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/bepisop.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604200535.pdfIn PDF document text
    • http://dogable.de/userfiles/file/80354951947.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/zokuzubikenojebixovenur.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/20110033874.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/sepasiwukepapapegexu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/3207689962.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c3114713---10971941842.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9c7d2252---70291234397.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f0476a24---33052575085.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/5mqu62c9jdse23d84lud0pbomr/komimuwemen.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611548fa0ae53---628877789.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/rupebunazunobenosawow.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68048c0916---81557540995.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nuwojoxani.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/77cf394cd95c3739a5195dd7076dab38/gibiteduzabiwukufivowato.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/bipezepizawipuvowu.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_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 11012 bytes
SHA-256: 73ff33f0df2a2a90e299c3122bb475ad1c94fadcb4b240a6e5d3aca4b12544c4
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16732 bytes
SHA-256: 1222d9ddeb0929da62ac48dbbe22e3cbea7df8f30cd95d8b8e4a1395adbb5f21

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