Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4558386e3720c80…

MALICIOUS

PDF

95.0 KB Created: 2021-10-15 04:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 292fdec7d770edc3489cd12b37cbb9f9 SHA-1: 17243fbe9a5abe83f823f49c0d7aa3b38cb9a4b4 SHA-256: e4558386e3720c80b9a1c359478cb805b78a0a925691dc1b11197f200c8a70f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kt6802hlo8mv7uqk7v2umve8e4/60081379847.pdf In PDF document text
    • https://kanalprofi.at/UserFiles/file/pegemosixoduxuteb.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6c44e95---mosefapimujijutuvo.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/40266415557.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/79839429211.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/pafejolefonijexerebapaw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16161a8301f79e---52571259814.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913144701643.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/43226418501.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/vudazonesipaza.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/ranojutupopofuxa.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/18081335950.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/sexogatedobaxogi.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jifibepapawetoporosupume.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/68498118322.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/80315025181.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/49601787541.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/rovepoma.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20538482178.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/99551996321.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/88166315725.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mawufifenusojilizozimemu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=controlling+anger+issuesPDF 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_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 17724 bytes
SHA-256: 4b299f7dce0462575a533ffe48783962ef0c438f3061572b07df3a0612fef63e
font_02_sfnt_off0001569f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569F 10416 bytes
SHA-256: f86dcd1edac7a683d6ead4ebdb754ef02c7890a49e86e37fa8284cae0cab8216