Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee1ff33c31131aa…

MALICIOUS

PDF

83.8 KB Created: 2021-08-29 18:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de5072130bc549e4b4819659fb32f33d SHA-1: 563acc5bec346c3390158021f4561aa9e94975fe SHA-256: fee1ff33c31131aaf480aab05900b2f03312e54ba39141d300567b3df351d29b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jyotiacademicpress.org/uploads/file/97703743128.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c853d722---xoxonudorajavilatabir.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160802a26ec042---dasuxoka.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/varujupedepituwivofokibim.pdfIn PDF document text
    • https://koratspring.com/upload/file/muzijeg.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ttmfr9oo19v66at5ck4tbl4314/16730281914.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xerejuw.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tirotenovedupupunu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/85846733727.pdfIn PDF document text
    • http://polletnv.be/uploads/files/55329700401.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28301b93c---29796823119.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/fevowenanifami.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/86922926940.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/radikekiloniwovenupa.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210624155254_1bnllz.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/25990571126.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/zejitosi.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/pobafezazemoxoderixe.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbe4595329---73853575368.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/86897355492.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca2c0e1f0fb841cd7da0d905f8a30591/27864537468.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/82239178714.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c99d46357---wiwiwamobomegerebamur.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a3e8ef9026aa9fcbb3035db06ee878ca/27153871421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=migos+quality+control+mp3+downloadPDF 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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 17904 bytes
SHA-256: d511ea013e88cc7d8bfd18a9b13410e25a76c56222321f64f945a62a4e80a2ec
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 11336 bytes
SHA-256: c8113500138957ab96be08def30c6725b02658f111e37cdd9febf0c0e75f1187