Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e764b1170f7519…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 22:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf1a90ce36f48fa4138d2209c15a9ba4 SHA-1: 58fddc1d6a3fba33019a021ed163f6e72484fa35 SHA-256: 91e764b1170f7519f77dd81dc421fe3fc154593a951029c17cd2080d8767a877
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55892001874.pdf In PDF document text
    • http://malagi.pl/user-files/fck/file/nefojunetefojo.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/divimeworopaxobo.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/66241048542.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/bagoruvikizu.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/fabodupabawusiv.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/45079346142.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2645a2ac3ef0ec852f1349adfe401da5/sixebevodumepepino.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/66717846876.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe6c2530e---xijiwakebezolovagolibi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/62642233210.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/zotowovarikenozavab.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e060c9874e---1672930578.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/xivuto.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/43848045219.pdfIn PDF document text
    • http://brukbet.com/user_images/file/99725216605.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/femofoki.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/pumixuxozejawapixir.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614b42f6a96dd---kudobolorinuno.pdfIn PDF document text
    • http://vaynhe.com/upload/files/37207132030.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/satasuzunamu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/33935185117.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccb287b394---bunexekumebel.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/70727608250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=brave+private+browser+apk+downloadPDF 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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 10824 bytes
SHA-256: ebb579378f1f5fb7fc38a84637403ab2df0eb66836a47a1d8725128a177650e9
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 17492 bytes
SHA-256: d8a77b08443aaef229f068de2b986a516cf3a0711e86140bc0e2b9dba337a89e

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