Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7e192c50cd2b1e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 05:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4222f78a1319db278b7d02442c7e411 SHA-1: 47680fd320d0df415cd14bf7e8203140dc7c1788 SHA-256: 6f7e192c50cd2b1e9d2aa676249d7cb346e4ebc7e45103d0b89a1f213bd5035e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c5ed257b5d187f18f6697b7dd99f9585/98075722696.pdf In PDF document text
    • http://julianina.dk/upload/file/2595401521.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/53120032312.pdfIn PDF document text
    • http://lobi.md/userfiles/file/79367849994.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a08bfbec---gijonoguvikerat.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908bb4bdfcd---2266401031.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/46084475331.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexida.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/87020898394.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xemaxamobejaxujesofoket.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/fabiweradepubez.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/8165535245.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/pimuropuvubunezu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/renirup.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e0f1d230---51153192867.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607065e860ed8---93668310295.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/0ni8k66a0nun7osg1oibrna7eq/pipuremezuzokoxutigire.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/30344239174.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/wafotijowexe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/79963698418.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/35235848605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=6+classes+of+animals+worksheetPDF 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_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 10852 bytes
SHA-256: 56a8ee296e655e38bb9eed5b4cb7dd18532b481b6c394d7ec4b63435a82c6ceb
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 18088 bytes
SHA-256: 4a1c957bcba717093b1bc54d76761fdbd70b00c4236b5392c895c412b98cbaed
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1