Malicious PDF — malware analysis report

Static analysis result for SHA-256 804003488d979f46…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 14:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29f36d3526457907d4730b68e6d0a13e SHA-1: f2e7e434d297bcb610576ddc19b72d3b9253697d SHA-256: 804003488d979f46d12403df8363c8923f1bb3c83add6effac641d0a6576ddaf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of external links indicates a likely attempt to deliver a second-stage payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608369c59e9a3---dipinevoroposapadoxurow.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9a14d6cbc---felamajubaki.pdf
    • http://kulturazebrak.cz/userfiles/xofuwu.pdf
    • http://anandtouristcorporation.com/uploads/domaw.pdf
    • http://happy-travel089.com/CKEdit/upload/files/refisodenidav.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f7d0456a4294b6c1e8260e1f3d01f283/gitalujofukabono.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/20191666543.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9405b32a0c7381ee0620aa871a05079f/bujikitedix.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082fba933cf6---varetogutepo.pdf
    • https://abofahed.com/userfiles/file/80881243008.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lfv4fld1b37ibkue6ddcke80n6/17181701414.pdf
    • http://donateagift.eu/userfiles/file/jisupasugix.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/84031272321.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/90k1jta7utts0i90jslofoh890/perolejijorezefevelatiwe.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e43edab8---visanofibugefosafobidofa.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zodonudasipa.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kc4igb0c3nk9unmnpa9779ppr0/98247381866.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607815902781c---gizuluzamozafologasopa.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2987fea531ca5794c31212836e435141/ximipu.pdf
    • https://cordovajewelry.com/images/file/27177623916.pdf
    • http://aweibel.com/Photo/file/76558250469.pdf
    • http://jrmhandling.nl/upload/file/53099808044.pdf
    • http://kimandyoo.com/userfiles/file/72150531927.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=live+paint+tool+in+illustrator
    • 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_off0000eb08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 16792 bytes
font_01_sfnt_off0001031a.bin
c561dda59e9e639630fe1d904336c93c6a4f94364f0fa3148a4dca723a520226
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 18224 bytes
font_02_sfnt_off00013257.bin
2f8ae3721849603b2a294ea31f0f897d5a1588701e2a879ed5ff9cd91f8c3752
pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 10368 bytes