Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfd372187a25d65…

MALICIOUS

PDF

127.8 KB Created: 2021-07-18 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65df51f22e5983bb0d54bdcbd2abe630 SHA-1: 55acf2d8d9c316880ed1408220be76410b764cc1 SHA-256: 0bfd372187a25d6598f47edad9e607ec3c70bf0e81739c89af3ec044a13bdd3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories, a common tactic for hosting malicious files or phishing pages. The ClamAV detection and ML classifier further indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's not meant for human consumption but rather to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1515a0c72---98402855275.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36ba4a409---xolelizakipemoziboramiz.pdfIn PDF document text
    • https://saam.vn/images/content/file/magewosoxofun.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc827bdb6e---koturiwoga.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bffq715h6c0o27k159kfqfgru5/51975408527.pdfIn PDF document text
    • http://sparkpro.lv/content/file/nupogutudejif.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a42eec12c---63598211186.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608685bf75a53---14190719660.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/menimaralaxikogulirujuf.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbc57a63f---37316524236.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3982b875---setusajilomekip.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160841010a1cf0---nedetirud.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7636818b5e98d99453e119d418e22266/ferakijelenezivolul.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bm5p5dhslqlfclvuat6iaudka/sawemutofamun.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d6554fbd---zanowafezigepan.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/96169109165.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/028fc6a0d5367b7b7c475d2b5afaff95/27357169358.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062220373670554.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/12181234765.pdfIn PDF document text
    • https://anfauglir.com/images/file/30324062257.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/802fbe5031de033fc5cb260c10138a07/mabezarekirolukebid.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/96460754336.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wadulanup.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16088e10ecc237---94083040847.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad2d1193a---jiwewosuduruzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fragrance+in+englishPDF 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_off0001d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1