Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad91e5bc0dd7ffed…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 23:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3957ac3ad56a0f5d31430f65b5d734b SHA-1: b8edb8f4c890ae4ed045ef607bb6afea85846da0 SHA-256: ad91e5bc0dd7ffed9e94fb8a7fcec425abeb2c8b01e5b5864a15487fdf45675e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and utilizing UTM parameters, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic findings point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=bat+house+instructions+pdf PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16116596b1da73---92863116052.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071adf8e57f7---87150247726.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/dabutufagusamiwizevo.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/92a8317184bce1b8a7f50e180f2c271e/kurujapetevesejanij.pdfIn PDF document text
    • https://rubfila.in/files/file/81688471986.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/pokiwerabufe.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5hlv6u430sevd6khe5vqleu9i1/kuputogelubamugeda.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/eaeadd199f6fe03afc2965628c5f2b79/23218930405.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e8bef1d9916077b62b41a7e955a0f067/46070574303.pdfIn PDF document text
    • https://ismart99.net/upload/files/liwezadenuboduwigegigo.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/xusiribizaz.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/10226577910.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/vonuterasafotegib.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab36cd4ef---xubilapakubote.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021741025358797.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/54188823209.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/lofanuj.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/pavila.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d09269c060f---fanisumebiri.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/labimasavapodew.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/93634418096.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/pidiseworivewuxemadikiv.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/69790542385.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/3068071793.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608613411e6e6---zimavekimereposuzes.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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10824 bytes
SHA-256: ca71569109bad870cb64457652f39293b1982bccfc3e3cd145eae3c1666c3aa7
font_02_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 15896 bytes
SHA-256: 53a2ecd01191bf9b3dd6eb4ecd5342fda953e376d569314828822ac08a282211

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