Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d4f64a6bc82f21…

MALICIOUS

PDF

85.3 KB Created: 2021-08-08 03:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f31a77e364347ede3839acb046556db4 SHA-1: 8728e42d9bfd77c0a6e51a29d46144590c4dd559 SHA-256: 19d4f64a6bc82f21878f260a935424a48d7b12d9b297119920ccec7ea97b86b6
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. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://impeka.lt/components/com_mijoshop/opencart/image/data/files/13943341408.pdf In PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/3374063281.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/25adc6e2cb6f4b99d6ed97760cf96c20/gejabozerilumexikotozapa.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13568cf93f---87023282135.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ac0dcdc5d5a17d5664f0e80fad8da4d2/xujutegaxumo.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/repifemipajus.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/49587948305.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/lumipupejufomezuje.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/37947829005.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b602cd344d9---kotifijitojepidolejikodog.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fde1e4e68---46460655390.pdfIn PDF document text
    • http://artside.org/data/temp/file/63487070987.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/78123810370.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dafenora.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4f4c0228c84ccfbefcca0daa3aea8b71/dotominapoxaripe.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/puleraka.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cparee8penlvombdl1kskfcg37/lusojufijev.pdfIn PDF document text
    • https://strechybenesov.cz/content/zilume.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106232011135746.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/kijimixalixetiwezuselu.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/6aus3l3kkf8omtfggcqgdla62c/davelujifupume.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f31bf0a0---lakimepodubekupigeji.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/99137427403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=retroceder+nunca+rendirse+jam%C3%A1s+2+pel%C3%ADcula+completa+en+espa%C3%B1ol+latinoPDF 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_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 11520 bytes
SHA-256: 6ec575a62acb40e8df3decc101cd78dc83d9c4c76dae157a2e10cba3e46a519e
font_02_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 17312 bytes
SHA-256: 12944f639875d9da2a7129bbed76e0af94bee6dd0cb0cd78ee330d627143ba7a