Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab997e723f2ea92…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 10:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbc23f3fd267347ba1590c2418685b27 SHA-1: 8ad00992c5f6b5b7870fba5d7a2a0f39fc670b5b SHA-256: eab997e723f2ea9233297947309da46742bc2620d22d4307796bbb50afe0021e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://cevhertemizlik.com/userfiles/files/kifamutu.pdf In PDF document text
    • http://dostrojar.sk/UserFiles/file/90677039431.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/79615c29472328c03be061ba274fefa2/midunipik.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/noxunozu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/65466070166.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebb65f571---52897112432.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5023fae8---69630518752.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc6de7dab---84485859643.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/37877099954.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/62712371363.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/tekekuriparov.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/eb4f0a68d401581e4111b5fbc34c7f5a/78303351067.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/801d9107a85e235c7e8fd8770a45ab8a/17615904724.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/pugojajemijesufup.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d2d806a5---tezejusogosojepibozojusi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b52353171d---14339700583.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f93bba6f2d2---98867497660.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/33d633823aca5277bdb31545244a1ff1.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/80362046431.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a7220a82563---88604004657.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/12290757279.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/93809208347.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082855e6f192---kigekozijaxe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6faf87oa5m44s92rrf59nf7m81/14237253049.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/77031491808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+built+in+chromecastPDF 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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 10812 bytes
SHA-256: 62db34e796ef94a86ae5a5374309e5173c7cd437553a899752eb8681e6d0f149
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 17004 bytes
SHA-256: 0f38c5f69fe9935bcb8710a0696dec10fc0944b45cd7db607ecd66410c629af4
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1