Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59d03e8d952d991…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 19:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9c006ff8a5fcef812d7e15354c436ce SHA-1: c90a184dfae94b14697effbfbcea40b1b43fd1bf SHA-256: e59d03e8d952d991f7f518c1ac10d49ad43f154b08197f05de3884482d623c83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://wastran.ru/uplcv?utm_term=pronomes+demonstrativos+em+ingles+exercicios+pdf PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb262f218---vagujiwevurofewa.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/30903097103.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/vexazogevobesufoxito.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7058834ce6---41751532359.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/92205544005.pdfIn PDF document text
    • http://momsystem.ru/public/file/lapelubirilelibifex.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/81f01a1610b5ae28d79679b79c59f68a/kozujokopixekibu.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/4061790450.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/95562808486.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/guwavudive.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/tebigesenojefegolebuk.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db166bd3989---75519804695.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/wajujuforeb.pdfIn PDF document text
    • http://www.centralperdana.com/file/jabodomafaxuputa.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/66306617987.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sqd08advs119fqp1iu7abub1p4/29507934445.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff7a3036e---sofoda.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/matopovadefipuxuzivemu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b921e081b---kumaputewudamufeba.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce773f2935---rotidisekowemexudimej.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/65871537165.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/u5vc38fk4dcik1tibqpv6v9fpq/febukobu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/75461400617.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a259eba1---90718197315.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/96564240398.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873122ac822---gelaxebuvebupitosedoro.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/80331228855.pdfIn PDF document text
    • 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_off0000bdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF7 17644 bytes
SHA-256: a4eb3c63d29bc515db70fa2e722b428d187f94fbac067ead538e5a7181e2d67c
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 11132 bytes
SHA-256: 800931aeccc02a7bb638424cc47a04d49fb829d51f2b8729db216c07aa4fc937

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