Malicious PDF — malware analysis report

Static analysis result for SHA-256 607860b376045c8e…

MALICIOUS

PDF

80.6 KB Created: 2021-08-09 17:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e98685036c46768900f1dbceebf1ee6b SHA-1: 9c8ba8f95b4f148a139b4a73eba6e091817186ca SHA-256: 607860b376045c8e67697347bbbb738369fb033ca8175d6064088d81564ba756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file is a PDF document that contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves luring users to malicious websites via these links, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://catamma.ru/uplcv?utm_term=zapatitos+de+bebe+tejidos+a+crochet+paso+a+paso+con+patrones PDF link annotation
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce842f0bd2b---49801466082.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muzibapetabuk.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/70538218073.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/63427570186.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wuruf.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8c8030d3---64903878908.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/eot5957fa21ukuq56oucdig1c6/32689828446.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/76270934664.pdfIn PDF document text
    • https://jss-moms.si/upload/File/61616567403.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb673775e---malaka.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798459623e6---xokigepedi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41e3f02372---46842196955.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b7c2ada5---lejakeviwutit.pdfIn PDF document text
    • http://www.asslar.de/downloads/raligu.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-08/210808131723060757f71y9gnuem4l.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/38815777646.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/38425362617.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/14320213424.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5c3be9c6f1a106878b06bdcea2eb923d/pajadev.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/94335261564.pdfIn PDF document text
    • https://jss-moms.si/upload/File/dajegepupagekatuluxozon.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3476886d1---30527525153.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c314a8780b6---83272977259.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fgv5ab07h72m4g2e5i9nqgaken/4431404868.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe8003fa1---98509134527.pdfIn PDF document text
    • 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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 10796 bytes
SHA-256: dd8f4741c97b191931d63dafbcee90285e7d869cb4c287663a643fd9ea2e1b6d
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16928 bytes
SHA-256: b885cd43b991b82805a87e3aebb82a8a3502013b7e8039b978ca257b6d85116d
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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