Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac349963bb570d5…

MALICIOUS

PDF

79.6 KB Created: 2021-07-17 00:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51eee8bce260b6bdf431a9ed7b810c9d SHA-1: edccde30e4eb8796d1fcebdcf1a2e3fc27cb84db SHA-256: 0ac349963bb570d5a550ec9bd89713c6561b2f9ccc0f179bbe985500ea69adea
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a link farm containing numerous URLs hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The PDF document itself appears to be malformed or obfuscated, with no readable document body content, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

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://caratow.eu/userfiles/file/wexakex.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/lofuxepaw.pdfIn PDF document text
    • https://kede.org/userfiles/file/7780369013.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/30732702485.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/moxududimexotikiva.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2d3409dba52be27b94549c7c33096627/zinazunegulotawizidu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4c5d38653d64d0f518bc13e743e0cc0a/12404032933.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/kiv87pklvrtq8rq61t2m0bn4oe/8600572375.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/91iqig8hvut37de4olof8fj7jh/41959307042.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607769bcb70b9---60431176652.pdfIn PDF document text
    • http://mamitobe.ru/files/file/gumivebufawatipotebegufow.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/pibedo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9a744fd9---tevisupiwinikulu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/ludav.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d6442d29---jagogutisajeru.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/16603350530.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107010525468619.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/lanojuvegika.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb196e5ec4---87450318012.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-10/20210610061559255308.pdfIn PDF document text
    • http://faradbox.pl/files/file/82848990863.pdfIn PDF document text
    • https://actor-conseil.com/files/file/lipasamikan.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/26519295332.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7b1e2418---48154232293.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/10467369844.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3713a09b---92153086852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=check+if+sql+server+connection+is+encryptedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 11004 bytes
SHA-256: f6962f671de98e6257dbe23abda49869e8c3e8551afac1a72d45151a46af10fb
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1