Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a022c6fb5a057c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 13:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28878e2b3875fa1c1633b9aab0575f5e SHA-1: 535607b807bc1a50c4acba0667a12e9214dd134b SHA-256: f8a022c6fb5a057ce5b9d20a11827a52d8df69c7efe3b4753239b4520d9617cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2d9ce27fed681e012a34fed2655729e/22077597845.pdf In PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/e2qd2qsk91nt5skji4kjrfqna7/69903071614.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/gijokovuzobobapavir.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/xeporolopujuxinasila.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/lmsose2am73fnomhn1r00qjdnb/34501221615.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/58067614733.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/farenilabekegozetenubuja.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sozizixorexu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0794047f7---63238869751.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c434f68008---8486854967.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae63292778b08a0a6f90f29f3e5f04b8/16639448111.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfc66ecda---kavovam.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/fugapesomaw.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607924cd5ed79---23196611574.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/37198541913.pdfIn PDF document text
    • http://jljemc.com/upload/files/sulatujobisin.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/17594815760.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/3aba023a273b9461ef357b1d0e7aaeea/vimupem.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/60405901288.pdfIn PDF document text
    • https://educhina.mn/editor/files/80116859569.pdfIn PDF document text
    • http://promador.pl/userfiles/file/texotelez.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081794757e50---11014904626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mineralogia+definicion+pdfPDF 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_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 18608 bytes
SHA-256: 0e6a31d810ff05339080b6a93c44f795d891e83034cf967f1b888f70ab7d9390
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10520 bytes
SHA-256: d1af18e97e248a7efb458a9302cf7cb223ea4b262b82141fe62205649fe5badf
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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