Malicious PDF — malware analysis report

Static analysis result for SHA-256 9678d408380d6339…

MALICIOUS

PDF

87.0 KB Created: 2021-07-31 01:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3172d2542e2280911e78c6db52e63008 SHA-1: cd89747b108e64f97d1ba5e9e0e3a9cc0976d134 SHA-256: 9678d408380d633901f236c5a85e5bc11354f3f4b8b00a1512bf0e38a8a55124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845e35ca2d1---tazomowarupuzipuri.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/elnauqmd6mtdb6do8bakhi3svs/25658686981.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/34278512931.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a09bc183---21891051660.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57783a65da---27939557637.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/20656557106.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078a072bbae9---ketusalekifevugabukuzinu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gcbnl0jm81mkt7jvlt2mgclgme/babur.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/91467940541.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9b6286cc09058a6877fc1625fb70e41/13677710990.pdfIn PDF document text
    • https://netpage.info/userfiles/file/fofejijozuduweji.pdfIn PDF document text
    • http://sciattella.net/images/file/nagujadefofi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c1a55268c7773b3938f9b369d2d00fb5/33055685550.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f90vspuh1j63vgfrctu8vbg91/xedixo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f4ccce1cd---bazurekowu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/11431064818.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/domavolipatorumulolozas.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/592d1d41215889ce264bb0b918f2c99c/19154111331.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/76507047749.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/xexameriletodadusebepe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38312b36afb3917788295c96417c1f87/fikoxusevaximemosuzuniz.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9f0b27db72edd97ed2ccd50880ebb83d/61348885691.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609657da8bebd---wakopunopowuzas.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/tsb1ntshdt7u67gnbcik3grgm8/32516121015.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862ec61b1a2---92160815710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=batman+arkham+city+lockdown+obb+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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 18048 bytes
SHA-256: 42c68e2658ecf7ff9e5c74a695765fb6cef27053446fbfb086784d3971b0f0db
font_01_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 10820 bytes
SHA-256: 58d359c63051281c88ab1cc7988d84e3dd2c27dc94e2bd30ce0773622a3f4a97