Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c416c08e1f308b3…

MALICIOUS

PDF

89.6 KB Created: 2021-07-19 23:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb65d57f6f9e6631b69e03304146b61 SHA-1: cff1ccd6cb4849866d778debf7e4e0c5a7827111 SHA-256: 3c416c08e1f308b3a721017edea737ab6915bac721c14d674449659f73690f50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://lws-realestate.com/userfiles/files/vatidejeworakigujolugevor.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/533e3df22bd2fd04eeabdb6397c7c3cc/87772497603.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e03e89108a---zonelimidilab.pdf
    • https://muratay.nl/userfiles/file/92581201883.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5137dddb---98033988938.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k1qr7lfd9tc6pd31uutj50k3bn/jimukolifawimumazegegi.pdf
    • https://acgroupenterprise.com/userfiles/file/wizakibusujepigazuxiraj.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mv5iif0ev42hcse01pg9koscuc/90643281848.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pescpcrdkvvd8mrmk1seklgak4/kimixudeje.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160831a9c5b3c6---bisejufugeris.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc8a23ee7---91624168968.pdf
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/mepipomesuj.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c9edc65f28fdf4fec1243ea8adeef51b/rasotimopuvoza.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1bbacdbefc52bb6dd6bd1248060e17df/96679429458.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tot6ndp7th055rb5pf2h0jst19/16072447504.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f07c1ea793c---gelefaxolup.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad7bc6f46---60363911393.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e98n2038u3u4263oqu4kdfujgn/pemipit.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609675df7f816---84788428558.pdf
    • http://tugrabilgisayar.net/resimler/files/99793272683.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/nejiwobuv.pdf
    • https://rosycaffe.com/file/xinifurejozateredi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086a430cb3ab---39932452021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=black+maine+coon+for+sale
    • 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_off0000f9c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 16792 bytes
font_01_sfnt_off000111de.bin
c81b7985843479b7efaab5809f4923d512421ad49be960c24c0d93937cbe8a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 10544 bytes
font_02_sfnt_off000129d9.bin
521126ceb030eced2dba326a596fa579cbaf8c1deb7200446e9795047cceb22c
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 18200 bytes