Malicious PDF — malware analysis report

Static analysis result for SHA-256 483c4f6aa41ba595…

MALICIOUS

PDF

83.6 KB Created: 2021-10-11 11:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a663e43b8850b528bf7bc1fa29f533f SHA-1: 7b61dbb053f8263837bb5523a85db0ced1c6ea91 SHA-256: 483c4f6aa41ba5957cdd64475b5ea49cec05e22bf3f102028b5441d50567e452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest it functions as a link farm. These links likely lead to phishing pages or further malware downloads, exploiting users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rjbmachinery.com/d/files/96055037982.pdf In PDF document text
    • http://thegioioto.store/upload/files/naribidumemozolimazuda.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/22968804648.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/81929099157.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/serud.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9a9e6161---20614136604.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/43118501342.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf2b66851---surobutobituniriw.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/simuwutilemegerawilekuseg.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bamid.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93bd0871d---wuropofow.pdfIn PDF document text
    • http://sksound.com/userfiles/file/dinosafimawowiwilemol.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/84497710212.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/tegubokipugajezekam.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/gamufapufugejunuduvuz.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/womusopexurebodido.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/majerefa.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210901083638_512207911.pdfIn PDF document text
    • http://kraciowka.pl/userfiles/file/jiropemiwukinubazu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/11572430831.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/jenidukakesire.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154369d92063---pipapitopivivu.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/99097795471.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/39984390438.pdfIn PDF document text
    • http://strandedtattoo.info/file/fetotubibagidit.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/84050436953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=dental+clinic+fitoutPDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 10160 bytes
SHA-256: 634d527e4a1f0ddc6820a0c6d9d76ff4578563d88fd1d4a2efadae53133c2a3d
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 19920 bytes
SHA-256: 735d2b5ea920da7b2e6562bbcb15dc9f55f788620a7be2016a0f7f57b0c0a90e

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