Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5989cef3cc4da3e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 08:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25e0187a536ac5dac61be61ce93ab4ed SHA-1: f3fbf425d3213e2640e1bc18da5c81ba4767876c SHA-256: c5989cef3cc4da3edd9d721937b883aeeb5cf2855a0525d58f8620ddc65a8273
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS upload directories or on what appears to be disposable hosting, suggesting an intent to distribute phishing content or malware. The document body is heavily obfuscated and contains no readable text, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://annjulieskarpmo.com/userfiles/file/67563543795.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/file/dadefenam.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/89457574788.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/39410913907.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/dezutivutopugore.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/goxemof.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/60joggnp3urc8hru5ufp24d050/91273105193.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/13845408205.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7505e28ef---18363453239.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hqnaqv45ieqooss8uk1fqvpc9m/kesexenixanujenatiliw.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/bovidogixedawose.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/28822617609.pdfIn PDF document text
    • http://cpils.com/userfiles/file/lirizazarijumapixemarerof.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/69131953702.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/fuxuvinewuporuwesivi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/99kumk2hl76mmch50te667bt53/79934488504.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fukugupox.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/87289727337.pdfIn PDF document text
    • https://orrizon.ru/images/file/kamugodofisanosojo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ce2n4gl2k2ri2e4ksr5vfnem90/wijuzax.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///21769170613.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/rekelex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=isomerism+of+alkanes+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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 15416 bytes
SHA-256: 40143a03f220855991e67fa322b695a9db3a3cf4fdce7fbbe9efb8d974dc6db0
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10604 bytes
SHA-256: bf4fa69abde202333e47f0f0dc0ba0fbba5f8a7fdba594ec7b5c0140b91c352c

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