Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e21c1a7768ebe67…

MALICIOUS

PDF

65.0 KB Created: 2021-07-29 19:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8fb42827fcedaece42f0684466f9d9e SHA-1: 51d62f3322a24659456b5aff65ac2b45be40ca44 SHA-256: 9e21c1a7768ebe679f128347e8ae1e482932fcfc5107e075d63a9a2db04b7d55
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. ClamAV identified it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9484

Heuristics 5

  • 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
  • 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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ba824ade989---3952939189.pdf In PDF document text
    • http://designbyjoseph.com/uploads/File/bebiwux.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cd6cd20f---pewesobatujatotoregeniwi.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/6734569717.pdfIn PDF document text
    • http://dzbnf.com/upload/file///monumapasiminaxiromiwewux.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/62249610557.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lbkmabhn37l7m8g6pqro6gb63l/42075148489.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/49962454920.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/74193713708.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/37731186292.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/199791c290304ef6272a47322c184997/48000095650.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c50e9398e75e1805a27c7f15c1bc1279/dibeza.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/68329981973.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb01d41dab---52662502112.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kabojuratakosanuw.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/vemixib.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/60eda6c88d64389029a6e5b46c402b5a/siviwutozokupowireko.pdfIn PDF document text
    • http://aven.su/userfiles/file/joluw.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/66539607959.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4302b9aff3---kajobozebiwedezerulegetul.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/v522tpugk5d6kdp8go9gf39vuk/fitobifusurowoxu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kjmglqki26p97eedriuafs14dt/fakuwomibitoporamokinali.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcb382349d---sirojuvanepebetiruxes.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cccf3d6fc---91452323942.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/05037abb556db1c5bef43a245db422d0/47114896966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=whaff+apk+hack+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1