Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c26de87c57ba076…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 05:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 247a7da0bfc65f4c5894f8ff5fdba824 SHA-1: 2d88d8916148ec029dea74dfaf24d22d92e70120 SHA-256: 8c26de87c57ba07607879dda23072c5baaf129d9fa8fa540c29cca3b75867275
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gammatradings.com/userfiles/file/18747960416.pdf In PDF document text
    • https://cmf8.ir/data/file/11011278133.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/womokejasabujovovovapat.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100b1094e2---ragimid.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/laroduminijakifaxukapekex.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/sokidotafid.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/70929756642.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/noxerimomej.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/8642134638.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef75841cec---lozuniduliledofevotamin.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/duturorunu.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210906_140A624050A65F45.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210919105138.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f753bd2---fapufuvobojav.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/zoresoraremu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tavojopufix.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zerenubezirisozaj.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/94140553535.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f25614f8---81121626078.pdfIn PDF document text
    • http://innersolutions-uk.com/file/34943203103.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145d3d944da1---94145158083.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/xejatatupifab.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/41145427459.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/86898448273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+telefon+saat+dilimiPDF 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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 10496 bytes
SHA-256: 9613c53cafe61991500de2602a83a4b53aa87de001e7477d8b7ef3952b92e75c
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 18028 bytes
SHA-256: e626b629d13372c217d7d74d3665d101de3547c6e9d07c3b780623995124d9ae

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