Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3fecf1e23b031d…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 01:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d80afcedaec3961b645a7df7409cf60 SHA-1: fca7951cb5f0704e38df04e3609961c54930077a SHA-256: dc3fecf1e23b031d0aa19264a6cae1aa11deb383d55bdb801aee6dbd90a19828
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to compromised WordPress sites and other disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO poisoning or to distribute further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455c5193a7---bidamenubonewiv.pdf
    • http://nineslash.com/user_file/file/dupozanufasujatafaz.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ce8568e52073b9e27b5cd3346b8aa24/nabulidifonodexo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd82b95f0---xufar.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074034742e35---bibefefojevisopafaxofox.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94582472054.pdf
    • https://ludifrance.fr/userfiles/file/bewenum.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ce859e81---miwunozij.pdf
    • https://maturana.cl/upload/file/gojugerupogezibefanapoj.pdf
    • https://vestol.bg/files/file/muzimuwisusulofepe.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b3f2e5bfe7e2a9801c8d1a72c7d1e467/piziwidakusexatipor.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/44761260961.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/891d41l8mutdn18blse3u2vmqu/zivunibu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcc6dca82---98488127197.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b58af0bafc896ecec9ab4d9adb3ce92b/8602005156.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22703c63a---barajobufotijizok.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff277a663---mosutelojikutiduziso.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/popanujafawawafejid.pdf
    • http://astro2sphere.com/admin/images/file/11751929649.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc08b83a30---94455183016.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b94821d---66388571592.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/17562286338.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85cd5855f---nekoxogexeva.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/23418792ab25c9e03416c999e081241c/51756197200.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03865b32dc---64209948631.pdf
    • http://mobydick-band.de/fckdata/file/13618395935.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=character+traits+of+a+godly+man
    • 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_off00010608.bin
23e82a9a0bb1c908731b697142bd17b5d1a40396dd6cfc721334957b9c22e00f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 17136 bytes
font_01_sfnt_off00013272.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
font_02_sfnt_off00014a89.bin
fd13986da64c2b7420375a33eddd638a836a2bea73a831f9feb825e4fda97764
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A89 11068 bytes