Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6524bee8e98330a…

MALICIOUS

PDF

77.6 KB Created: 2021-08-27 23:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb8dad6341ca506a22133467a82b666c SHA-1: a114801c89c343b023be35fb755b9d3c272af008 SHA-256: c6524bee8e98330a7f1548d46e6e47aad8a4b18f88f49b76cfe7e33af0008a20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3658f7c06b---93440632639.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a8260da18faaf2d16622f32f54508922/89458997797.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lrn35if7o18du3nqh5noasi396/86782215920.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42318879342.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c064bb2d8c1f7f84f1ec2dc6d4032485/patoxi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sototufiwe.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b6b4bbca276---gadepizipizolalekaj.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/tukokifobuzusokomonijon.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/19892567342.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/so5b34etruq1o4hf8rs8vsmvt5/51456723609.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fukipawes.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e5305e8822a7c52af1e572a87617f3ff/66121082612.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210802_170712.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wijinafaresupo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/59287671620.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/9509969847.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/33871431080.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/680496084.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/78772217575.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/88959253445.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/wozaz.pdfIn PDF document text
    • http://tochuchoinghi.org/files/funobuzigeterogo.pdfIn PDF document text
    • https://atl-50.com/files/file/15580830076.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f99c4c64---12931360621.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/458323c5ff332eea25911d78da72dd46/modaserab.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/46d73bf9f1ebc7411bec263201d26d59/16223869538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=unseen+passage+for+class+3+icsePDF 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_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 10736 bytes
SHA-256: 747e03421bdbb184eba98ea2faef6c1e14b4909fc0166a0082fb3ecf5c4ad110
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 19432 bytes
SHA-256: 086c03055538810ec5101c3b3cdc9741e87b3097f31727b6f594fb40882c9067

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