Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3c04e0c9a4236d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-12 17:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 419720e0885b9642bd5068d12da34fcc SHA-1: 6f18c1d6bff04912f4c42fb57224d9025018e4a9 SHA-256: 8a3c04e0c9a4236dc63ed9d77de43bb61474fea77c080c5db8655acc8c8da172
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2po4o4dr1t51s6ff5poe97eke4/nawev.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160831e2f7d369---kalutewilosopezumogig.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47d1c0f9431240cc676935828ddb6c49/jumukewipimituxoka.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d8b1101fe---48628831074.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624802253_3aae2eb331.pdfIn PDF document text
    • http://technocom.pl/editor/file/moterajefisinadosa.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/gulepevivu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-30/20210530012439230208.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/56185167437.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/2099585e42ec7ca0342497e50071c223/mujejabonu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/10488823259.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/kt3eefo82m0f862o4bahl95nvb/20171656852.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/fiu3gk4dm2suut99bhp6p3o4vl/vovam.pdfIn PDF document text
    • https://noddy.nu/images/file/90122762734.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/np2mua83fdtfj6slqokci020q8/tifopanuvut.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503140809801764.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8522790fb---nabiba.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/djs57gsb5idkec8rpkvqs3pscn/64333216392.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/16f9639c88c144769defee4154a89763/pigetuledazuragosikexiwe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/92803659315.pdfIn PDF document text
    • https://tomas-music.com/contents//files/71315554476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cuento+la+ni%C3%B1a+de+jacarandaPDF 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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 17608 bytes
SHA-256: e36e12206f9ea03c289bbfc2e2c2eded4a1148cf55748bcd247eceb8d447c97b
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 10664 bytes
SHA-256: 1d07dacbed41a60642aad6fc4027ddfb4b7627833035664f9de9990f9719a861
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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