Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f8bb0a784260f3…

MALICIOUS

PDF

74.9 KB Created: 2021-07-30 16:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c90e5e84983c721f984023beeadd61b SHA-1: bb19742d4d7a44cb1738b1ca76f4cbb4a5895d01 SHA-256: 15f8bb0a784260f34fcd50d237177489d74e7ead9a084a75016e33370a8c19fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9b28729dd---dupetax.pdf
    • http://homenet-spb.ru/userfiles/file/42784014041.pdf
    • http://anhbanglaw.com/userfiles/file/78091917873.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2998fdf08410fdd8efef24b3e9344aeb/fikajowitekijepaxapig.pdf
    • http://camionespanamericana.com/userfiles/file/nurafijipokojat.pdf
    • http://to-kajihan.net/js/upload/files/41665184017.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/navuzivujojiguxafuk.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/gizaj.pdf
    • https://bdaudit.ro/userfiles/file/71333808826.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160866d9d846a0---daras.pdf
    • http://eros-arena.de/eros/userfiles/file/14501796823.pdf
    • http://elazentrale.de/images/uploaded/file/73415808595.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416ad109b2---toviwisagirikarapekuxoke.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160746a7072d55---bubupodosorekilagofuz.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb7a09689---87864799141.pdf
    • http://a-pluset.com/userfiles/panatiz.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad4ff7035f7ef4699fa900c8dc6e9625/lobifofulalokix.pdf
    • http://rc-mst.com/mst/_upload/files/88236630405.pdf
    • https://kaptenhoki.net/contents//files/99199176784.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kezutokesotesevibubeteru.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/9244414746.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983e4a152a2---73331613526.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/89a2f2tmh3f4l4451ghe987s1u/5813726861.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/41982478649.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f8741ad376abcec25d048823faac07/91110094165.pdf
    • http://absolutelyneon.com/userfiles/file/87406666178.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sql+server+xpath+select+attribute+value
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c121.bin
faaf7bc29b21dbbb05a03eab1f18973615a9fe9f5536b708e6917bd75286fbaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 10876 bytes
font_01_sfnt_off0000da32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 16792 bytes
font_02_sfnt_off0000f244.bin
855979f749c0c2f25af59b14f8b85923d265b84c3cf50369cfd964f9ccfc0cab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 15740 bytes