Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1c32825080ffe0…

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 01:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d5b353e6b6f4215d9b916ee03a7aaad SHA-1: 4e41346cf95d88cb6035c16a640ce2340c18df08 SHA-256: 6b1c32825080ffe04cb0ae07a4bb3598fc3006d7ebe71feeb3d333c7a1f6d1d9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a link farm on disposable hosting suggests an attempt to obscure the final destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=wembley+stadium+twin+towers
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/12e190244c9b688bc2a1be5c8a599812/7380721563.pdf
    • http://bmcnx.com/userfiles/file/zebevasegezag.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b00fdcc37---7333080641.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a1914caa---diwemibowi.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/db6e286bf14ab052481c031817715fd5/77832996377.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607430ece91ad---kerizatibivuzudemenetileg.pdf
    • http://spreewaldatelier.de/img/editor/file/xijexilisudujepodadal.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d2888374---44999403903.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/fp3iob5m5oodldlutrimihh8nh/69034096331.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1mntne75ja1hmhb8u9gkij2105/jamumaxej.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c28f2ec0e---63365118807.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/46112300230.pdf
    • http://paroissedementon.fr/upload/files/sigakewusalutamu.pdf
    • https://rijst.nu/userfiles/file/94295802391.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160790fe410dbb---sirajukewisenepapiju.pdf
    • https://artbynela.com/uploads/file/zepebidonif.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a0e087acc3b71a2ea9e4e8df14835215/81007974634.pdf
    • https://starwebline.com/calisma2/files/uploads/36140702882.pdf
    • https://robert-zauer.cz/userfiles/file/61525266537.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/165ae4aea9627da8f97c7a7e5129bd3a/55051646301.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf47ac7c334---99130520480.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c54bdc84bef---zixiraruraworusomi.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/wojubawa.pdf
    • 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_off0000ec14.bin
f53d83584aa6baf67c2c35e50e61b0a00a2977c922ab4da61bf3457940e77618
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 18184 bytes
font_01_sfnt_off00011c60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 16792 bytes
font_02_sfnt_off00013477.bin
87bf74e9a738d43e319183b3cb58e3bf405a3f61266ac4167bab7902083cf4d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 10844 bytes