Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ffd0485cc9ccd8…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 23:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6fd0346c1246161569006a754a52cb31 SHA-1: 892bc6ba5dc4c7ce45705a67cfedbe31b4a2ac57 SHA-256: 52ffd0485cc9ccd8c5d8e465672c108240ab63bc9d0bff8a5dd028732cd77181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://writtenmail.com/upload_images/file/mugiduranolaxovofel.pdf In PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/vepukirizog.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lapupisotuvekasib.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210913_111019.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/78430717453.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/debotadapuvijuro.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/79839429211.pdfIn PDF document text
    • https://red-adlay.com/upload/files/sisosizawamowar.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/madawunowom.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b3123de8---70638735997.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dbb24aadd---69254926774.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85835801016.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/87d9228b151ac9bfcb1aacd1433b5d1e/zupivigavoruwagi.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/13728025915.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/veraluwi.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/16428337221.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/tirana.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/lipomixerapibada.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/92444256238.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/2979977751.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1euc4e7j1sjp2oilkraej80m8/84788180623.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/berepizij.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/92104699323.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/66895630082.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/96517262115.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/16445086607.pdfIn PDF document text
    • http://mfahk.com/upload/files/94220667039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=proxy+of+piratePDF 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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16900 bytes
SHA-256: e4b35de2476ae4d61c496d99888cc3798e4251d176117e08c20f35e28718b019
font_01_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 10248 bytes
SHA-256: da1b38c11cdc96d1a16b0a46e4563a2a9934a93a619e55c7588c987c9dc252c5

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