Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2047a6ad335635c…

MALICIOUS

PDF

95.0 KB Created: 2021-09-10 21:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7ee1e8bb77e58e983cb279241fcff28 SHA-1: 5aefee793b3fc7bf7e17a6f6014f8cc8c436c8eb SHA-256: e2047a6ad335635c72cddd7e5f95a88152609f2ee89577bec2ebd06ef09140f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier, containing embedded JavaScript. It also functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised WordPress sites. The embedded JavaScript and link farm likely serve to download and execute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sklepbonus.pl/userfiles/file/jobesufa.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ffc94680250cf7e970fe0924f538e1e/21106050149.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbc6bf0bb---32963261779.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tiwifib.pdfIn PDF document text
    • https://soechi.com/userfiles/file/fowizibakutozuxateruxadov.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134d27797dfa---72694556355.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/ponapupagaluneferigefela.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109032125326848.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161395a0477a0e---gitunemovag.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/32520047013.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/reruwiderojowebemorili.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/5813623290.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/lumagifelijetajatuwanubev.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/2683282957.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nawutorofujugusew.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zajotadodeko.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/segozawadidog.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccd9ea0f8---85079694482.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/75401701596.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/zuput.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/12355778586.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/94968409294.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/11424194716.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090903030073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=clash+of+the+titans+2+castPDF 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_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 18844 bytes
SHA-256: 5f4e84de07508ff1388b7fed00ccb535ce9163854b83acb750d1212c9fcbc829
font_01_sfnt_off00013e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15654 10484 bytes
SHA-256: a7e2a73192be5b6f4eb67c6e5227477a38b8e56cd0c25567dd33178597ee685e

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