Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66c23ee7e75062c…

MALICIOUS

PDF

89.7 KB Created: 2021-08-17 06:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9729b7f7f5ee4ee53e0cc8055a116522 SHA-1: 9662042e06e7b2d4a99d0e5cdeceb94d637c8c1e SHA-256: c66c23ee7e75062c84bbfd3426e2da91dcdfc182b5bc69e7ff70f041a29e4222
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm that points to multiple compromised CMS upload locations and disposable hosting sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malware or visiting malicious sites. No scripts were extracted, but the structure and URL findings are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://automotiveenergy.cz/userfiles/file/82379632463.pdf In PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24944718853.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608395e1d502b---zifuge.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tnk0kn4qnoabgirrikaftrlkgf/boratikinajefanuw.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/gutakulapumopetofuxan.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d6590fdb---67086678763.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c188b8d0e8c---naxivaruzizevusasodo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ba1b55d01810894833669d99e487656f/zaviwezisupewujagok.pdfIn PDF document text
    • http://sam-global.info/files/file/15737927489.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c302e5517fa---zotopasitadepemevukazeme.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/10981112495.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pebapikogokusilalusuzavo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/241d7746b145718958dae202a942d122/wolojano.pdfIn PDF document text
    • http://www.heksan.com.pl/file/81380599600.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/ludoxopogewafeg.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xupapidijenilawiwotatonix.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/50148375247.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed021b16---zitozuja.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/62832049846.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/xuludokepiw.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/05gi221ptvskc3o6jl28nh4ode/jewofarig.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/16258970261.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/32060380822.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e6203951bf8ead789f7cf9d44d35d324/dotunudugewilavit.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/296d516a1eeca5a3ad90225f7e1eca3e/16361138320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=edexcel+as+chemistry+book+answersPDF 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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 11152 bytes
SHA-256: c935796e958f676d5189e9505695695c6e277a106c00fbc4097cd4ffbca3a0a3
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 18252 bytes
SHA-256: c148afe1f4fe46a39ca88097fd9f510901730f64a2cffda5a1f8a0c5b51fdda8
font_02_sfnt_off0001410b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1