Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b4d2b94bc11151…

MALICIOUS

PDF

87.5 KB Created: 2021-07-31 16:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfdda30bdb1d521027dffd64ca866446 SHA-1: 1528398240b065316016dfb2e88139aeba5fd1ee SHA-256: 28b4d2b94bc11151759d8a38966daa72480ce92ae9108608500a688e7a39251d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4b0e9507---sorapaxuludalisojutodoko.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/44cf14cea9d9a11ecca03b770eee0663/faser.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfadfa1fc3---7528016911.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/68536866409.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/968a2eed1a9e4b323195c56b3dde2127/20583563489.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a96efcf964c3e74a9e059b154c5f7f0c/zifikivejemitov.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074477796c33---51971767561.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/paposevijaginuvud.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caac3123906---dejiluzewug.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d27964903100a3a9492d709cc05ad978/fozafuxazizufajenataxu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/zojigatamawufapuwu.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/ruvoru.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c28c4df278558991bee8ea3475b2ffb0/jepujane.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3b8f2ef4af555c3765bfed0bf7e866e3/pulovagazekexamorolu.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/pugejoxitapupizidigunaw.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/92455355000.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/34589f3bb8b011f76150783c61d8018a/lukepukexowifetetoranar.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0cee7a3d2---5972960986.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be3b9ce2d---mavememodili.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/68460673762.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ad2ede90---xokorivetapodagoxofiguwav.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/kokebikobajasuv.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c58c47a0f---85115076063.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988765c674c---2263810603.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/senegabewitajinotexoti.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210718041644_jf3pie.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/11ec7b35050a6d3079302e72fe85f0bf/8080856809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=actividades+de+matematicas+para+segundo+grado+secundariaPDF 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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 18528 bytes
SHA-256: 20f6e5277bca7dfc0d14d38afe4ae0519f77e03854fb97489c38bba663f0e768
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 10960 bytes
SHA-256: 2843fd03c9e5131e446b0a8c194959d4d3fe092796777a30e9b7a0d2b72043d4
font_02_sfnt_off00013516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1