Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c37ba284d0e2b64…

MALICIOUS

PDF

83.6 KB Created: 2021-07-19 10:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba07e19550dafca8672ce183f7cdca7d SHA-1: 6f3c5c5a3a597f928c4784a561d168a0cdab8da2 SHA-256: 1c37ba284d0e2b641d495fef6b797284bd8d044bc385b105c169ae4e77602a0c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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 http://lotusromeo.fr/app/webroot/files/userfiles/files/14434165496.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/oolovo377egg0c36a0l839a9u7/90783091059.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zireworerajasobugef.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/nemasurut.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gexekupejopoga.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff53596723---90423096363.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9d3790d6fe---60538946910.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/1827234085.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210628205157750.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/xukamaderoserugadurebogo.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/vovip.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52d873f87---11185004847.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/20514315967.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/50076774178.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b9b95f679623f12e9f984952401e7b2d/xenowal.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090540f59987---paxaderunonupomelig.pdfIn PDF document text
    • http://614move.com/clients/4890/File/kozadaf.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/58453907533.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083587b9d2b9---85144361369.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/66154703779.pdfIn PDF document text
    • https://mnlex.it/file/gebotedaxadug.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5d405779eaaef19cfce74c9aab6072a3/7639850145.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/oc3q54b15va236vgbn4tqf8s65/3831585726.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/40915227775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=s+place+namePDF 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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10032 bytes
SHA-256: 2c86d8358656eccae3667ba5eecc8b7b47202329a8f145264941b35d57bbba2f
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16908 bytes
SHA-256: ab48fe6377ec6d3539ff92d6a7e598e0ff8629a0b948a12f9520df658bfd00b6