Malicious PDF — malware analysis report

Static analysis result for SHA-256 a382afc11394b0f4…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 14:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a9ec5112695b96a2f32b1db9448b292 SHA-1: 8fe8071b1181991ee58a18621e689ee81c6e8a10 SHA-256: a382afc11394b0f43c311f5a5d6b554d5eb0cd29fc3217e86c1b8d55e0d69b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files hosted on potentially compromised websites, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/aa4c00c38f3355075daa6be40c83e5b7/35121082651.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8913f6b3b5d34aad75fe36b8e693c67f/danamumipenuwumiluvirib.pdf
    • https://decoveinvestment.com/userfiles/file/tewutazapovumufuxef.pdf
    • http://jtour.vn/userfiles/file/16431163576.pdf
    • http://massageindex.nl/images/uploads/maxafejeridovamab.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5e9e035e---2289407875.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5528117f---powajumixifaferusun.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1efe0f3a7---pagetidi.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f02a5b9e0ed7b53fe1c905d771a9ac7/37771957680.pdf
    • http://scvumaichiramen.com/uploads/files/sopetitefojinigifug.pdf
    • http://ecohost.ru/pics/images/file/kalafodupav.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd56f00a836---janikozaranojufomiwur.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c772aede45---vifesixejifakewuruda.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38cc80a23---refet.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b0b5a198---48947728305.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cde2104ca21b18ef55dd633f56167970/43409683627.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5c112540789ce72d24190bf6be970d9b/67588647429.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb08ba390fa---18184854046.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a08005bf7---3701901407.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/tujev.pdf
    • https://hgb.se/filer/file/lusesa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cp+singh+physics+for+neet+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
font_01_sfnt_off00010716.bin
1fdbbf2c3d8f4c348f5b69f12b8fadcfc802a6b76a25b1d167db82d7f41bf2b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 18820 bytes
font_02_sfnt_off0001377f.bin
2accdbfeb96590c4557ce910c9f2de3cea0afe9f914897ed464f2ca7f4c515d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 11132 bytes