Malicious PDF — malware analysis report

Static analysis result for SHA-256 c105b274fd460789…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 13:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9565e653c24119e0a663a8cb49b1fa73 SHA-1: 80af68c3d38b2e9fea6803e06c461c1ef247a801 SHA-256: c105b274fd46078919aa92ed908058a6667ee098226d3e97682050b2fd1f77cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ab006318---nubife.pdf In PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/pifalokuwemebejekerego.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/53317892592.pdfIn PDF document text
    • http://honghuibio.com/d/files/71593689983.pdfIn PDF document text
    • http://dgkno.cn/upload/mavebejatoronasupev.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-09/images/files/gamiviteretunagu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959e448066---bazazivaka.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a943c67ef---38764530754.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/pujozeraveg.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315effac24a---ragokebalu.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/56117604877.pdfIn PDF document text
    • http://gapp.fr/medias/files/wukotipebixekaxud.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8a603a65---zenarerobareromamap.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/99011693016.pdfIn PDF document text
    • http://wirheiraten.de/images/file/fowomakirurabunorowof.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/38337766969.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/kakokobimewobisezux.pdfIn PDF document text
    • http://happy-land.hu/editor_up/60589792237.pdfIn PDF document text
    • https://binhvi.com/upload/files/xonekin.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/94400740500.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/96e3a19d56ef7ce2cd4a02f1dc84ab5f/zituzatidutinezidimimoj.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/nejesutudobu.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/rirefodezulobo.pdfIn PDF document text
    • https://digireg.cz/upload/99929761146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=recover+photos+from+stolen+phonePDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/44847731507.pdfIn PDF document text
    • 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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 18604 bytes
SHA-256: 2f97bbad9613c271f330ae4b8c071ea27bd83175becca6f1b382ed0b2d8dfb8d
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 10604 bytes
SHA-256: 924844dbb91f7d7a10f1186b51c85167c6b0878533884a9307e00528bcf9a02c

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