Malicious PDF — malware analysis report

Static analysis result for SHA-256 475fd4e018064de3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 04:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bff75f74be24fa08cc77d2ebf7ae4da SHA-1: f375db6afa7f53bf7ff59d09ae0457b4ab428ca6 SHA-256: 475fd4e018064de333e57608cf8a76ccd16b45807873fa42fff8ef2ef032632d
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sentezetutmerkezi.com/upload/ckfinder/files/nefugewimuvapitudipegopo.pdf In PDF document text
    • http://ramenhajimetustin.com/uploads/files/15506270738.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/fenalijobak.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/34883855478.pdfIn PDF document text
    • https://yasacompany.com/upload/files/fozexarojoruz.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3965878189.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/sizedilu.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/76975355004.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mepeponoro.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/30956113907.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/46084108358.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/15201987254.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c350d633cc2c92f55d243afc181e08b/21062478304.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rodiwivowakapor.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-13-15-26-45-fbFmIum2.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/48218247612.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74326413665.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347b16448da---87636131774.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/68198392075.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613048afa1e85---tizidoxivofuwedowa.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161409279ca22b---laziduvugokiso.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/31341379895.pdfIn PDF document text
    • http://dalaichau.com/files/vilowifulugeno.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131675446610---76331565914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mac+android+usb+file+transferPDF 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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 10700 bytes
SHA-256: 2812672d5e5780704df49f79f312c25f9ed61d30a11a8feb72a3fd906d44c958
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 18708 bytes
SHA-256: db251d846260367a50696dabd518bb946b88ce6f4a9d2fdc9b7e3edf375906da

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