Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c60df9b8030837a…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 21:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 900696648732bcec4ed2a71914b60b7b SHA-1: 6dc89d0acd9e01c8c0d32ea3f5ab3625a361819d SHA-256: 5c60df9b8030837a6af90d68f5b57d47f6a23d0b1d21eea0b8670a7bbeaa1aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the structure suggests a phishing lure designed to redirect users to malicious content via these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837105a8882---tagorujuzejoxiwi.pdf In PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zavojeseravu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-10/images/files/76989612976.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jalesuvumomokibiziro.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbcf1f0eb---peketimebi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5482722a20---xutun.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/45523281567.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/316b93e874f4c534c645898b316b1600/fexogad.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sumefokewuzageli.pdfIn PDF document text
    • http://valeneighbors.com/userimages/wafogomimiredakolupev.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/18185769639.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subukavamudavasabadoxobes.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/opt0i2gsb4ua781mhs1ih9foh9/dexotaremelalisifexuzi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff5f5b9f3---812150367.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf879bb7d8---rurupasizalumezoseniganot.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d44e6fa31fd28ca571d69d66bce06198/77669138643.pdfIn PDF document text
    • https://spacio.hk/attachment/file/33743080763.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xonovibuwaberojodud.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/bekavatulejubosekowawok.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/97337721473.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/raturozujukuvogukafoji.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///94932425062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=muratec+mfx-2350+service+manualPDF 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_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 11220 bytes
SHA-256: c27a90f59a934cc3d8aa00f3ad73820c0d5892218c4aa29076db365b3cd1be9a
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 19920 bytes
SHA-256: 66b3095cb8b208914741c4f9bec4f6f41614d7c705c52052162ce3ec1b34eb67
font_02_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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