Malicious PDF — malware analysis report

Static analysis result for SHA-256 4232ae2a24663354…

MALICIOUS

PDF

88.6 KB Created: 2021-05-09 20:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b46f63abef5b80236e707419437bc0 SHA-1: e2c3ca14e5af883434e207dea65fe5a1e8b141fa SHA-256: 4232ae2a246633541976c2d2ca663ee2f908d6c9629e86b5bd7dfedb5981a143
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic findings suggest the PDF is designed to host numerous links on disposable or compromised hosting, likely to obscure the final malicious destination. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9520

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=apache+active+directory+studio
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089c22bd877f---31778640640.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/acl94uj75qo5vik2g7oubpq662/21520929016.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082da32dd46b---68139328066.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5194cc054f5373b5f8610f028371dbbd/25151012115.pdf
    • https://tort-art.ru/userfiles/file/jedolol.pdf
    • https://asthasupermarket.com/userfiles/file/megusulelexefexasufezitaj.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/08hguds718vk215rc91r4l0ha9/potoburas.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4dcd7f55---3037986228.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6523681de447176022617dca8058a6e8/56282918556.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/imfgc4e2s4kppdpmdifa86tohd/61287616848.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160702329e9081---33525892840.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i3ur2kfacu1f0ug34hhiv7rtvq/bobamofujifutugut.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1e66aa1a13830b2c01c0b5e71b766e65/zafitetokagovovisobowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001292c.bin
46fa3cf27b72b2a64a672516010886c58f2a301338f46b98fd9faa95df49eeb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 5280 bytes
font_01_sfnt_off00013b24.bin
da96c5f95054546cc533c980eb562e8794de838cb404ddacba7741212ad2cd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 11460 bytes

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