Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b992f7ca3824c6b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 07:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 345b1acbd267d787d90e1a1e5a20d4af SHA-1: 763adfb59bd7f8091a6f08a29dd0f974c52e5758 SHA-256: 7b992f7ca3824c6b8b821e3f38b2a6eb43538419b2bab697c30427db6a2cc983
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, and the presence of embedded URLs and compromised CMS upload links further supports this. The file likely serves as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 https://coretry.ru/uplcv?utm_term=or+and+either PDF link annotation
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee5dce435---65153315594.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3bf1c280---gubojaxoguzimafemijotu.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/kusubofivanokam.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/54905460996.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/28793707642.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d412c0e14faf5d972aa6c5cf63ee3685/16225892170.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/os7ke5qe86ue7maa0havhg84hk/60124539952.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118ffc8af101---sozubudewepegakasajado.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/920eb45541bc9da6b9aea5bb33c5b651/13247638957.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/vamivom.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/72270937389.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/13994607092.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfc451be7---23960702894.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df10ec5aae1---73490879902.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/40258034588.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/450c15ea5a1cc750147cce7a93be9873/20656155119.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b3129fb96808cb0458326f437b878761/60347152779.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/72462758544.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016246fd86---31306777520.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/jirowexotufelotedagebeto.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nejigajarifidaba.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ad6a2a5785a417ed0cdf1a8aa5f339f9/xoripabifovuzodawidese.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5feadfb69---junibepokepitiseparukewap.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/kopamizuvawusavizaz.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/wagodilodetezufidemaved.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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 10036 bytes
SHA-256: 1ff002aeef27e509bb78b2f0dcd582ef8384dfd6ee9af159f9d6f5ef99a135fc
font_02_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 19080 bytes
SHA-256: 534f2824304e87090247553cdedd3f63330a8f87e89d629ddf6f3203a6cde40f

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