Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bf27d09f5c4e37…

MALICIOUS

PDF

113.2 KB Created: 2021-09-05 04:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4dee936381abbdd9820da23adc70ee81 SHA-1: 58313792cee09fec155f628cc15c9d33c3db5a82 SHA-256: 11bf27d09f5c4e37434b3d5a539f171734413a6e7a9068d4ee971ae2dbb6325d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ndt-ultratech.com/files/luxelokiz.pdf In PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/vobowosobavikusazoj.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/figoxozijafeveworuli.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/gowakir.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/titonibo.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/61643711996.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/55551179999.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/kosaxivojewawes.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/texomugenizulum.pdfIn PDF document text
    • http://simoncaulkin.com/images/7727035525.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9a6b8fc8---59753328083.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87105688431.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ce470234---69997268106.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/74765040244.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d9ee4c3a---38170087056.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/3429372419.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/96550133921.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/mugulapuriruforu.pdfIn PDF document text
    • http://annabarons.lv/files/files/99235132617.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/32b7a063bc6c66cba04e2be4f217ec5c/65255060234.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/78743103713.pdfIn PDF document text
    • http://aweibel.com/Photo/file/97719729759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=introduction+to+modern+linguistics+pdf+free+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_off00014c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C26 21728 bytes
SHA-256: 99429d844452a8de32d6bbd86dfdbd819acb8a0a6d84e4206ade908156a3cb0a
font_01_sfnt_off000184af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC6 11100 bytes
SHA-256: c4a3139d5031917afca8ccae6d4c071ef81ca1c6f3e4da8d0d8e6961d75dc5a5

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