Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c9168799d26b43…

MALICIOUS

PDF

101.9 KB Created: 2021-09-04 19:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 072e497eb24b71816e36d8f9823451b6 SHA-1: c6568980b683062d76eb7292d9f79d1561ee04cf SHA-256: 52c9168799d26b4377a18aa3a758a0311d7f404747a50bed63fe29e2fc2db10a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites that appear to be compromised, hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131832638c73---bugedasafiwovorotepanop.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e009a2e8bc---sevisusuvijejikadi.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gunititukobebigusekozeme.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/91478728696.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608222ee92752---dotuxanolobe.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/0a2595e64018d577d865d1a8a8ea5521/83303066207.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zaporowe.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/60910923982.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/bewezovazozit.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9a01d203---bubalesigijutu.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/16187555942.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/bozirodip.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/motuk.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/sijozuziriku.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/pabajepirajibate.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/49166153497.pdfIn PDF document text
    • http://slsnn.ru/content/files/jidixukeludi.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/32200931369.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/drmgjvr5e7oiv51heoc102ma0e/mubikagodumafuparazixil.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/tawabikabudiziwasawi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755e6854295---rujevudupobeni.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/29052002057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jnana+yoga+in+bhagavad+gita+pdfPDF 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_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 22900 bytes
SHA-256: 1bc44912c8c4f2d92379f52e23165d41ec55d0e6b75a17266a3113213334295a
font_01_sfnt_off00015a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 10644 bytes
SHA-256: 082957830f690e6ba6b68f9188fefb17b3806a396820f1f6d03665486959d73e
font_02_sfnt_off00017266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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