Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e138e7f884d5d1…

MALICIOUS

PDF

80.8 KB Created: 2021-08-16 05:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dec72d8e58bae815c4d3ea32738d0e38 SHA-1: 79408c9e68b39e6fc61def1d94e1b47a8d6fc463 SHA-256: 58e138e7f884d5d1bc8aa78851c78e94c6c591072cb958c7092f39f4e44a8416
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to various compromised websites, many of which appear to be WordPress sites utilizing form upload plugins. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely part of a link farm designed to manipulate search engine results, potentially to distribute malware or unwanted software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=descargar+nitro+pro+9+gratis+en+espa%C3%B1ol+64+bits+crack PDF link annotation
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazugadanoriwizuresasexun.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/40950792985.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8726f32e0df7c678096deac2e8d3f741/33258477139.pdfIn PDF document text
    • http://katachizu.com/img/news/files/45550041802.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116b30920ba7---potatu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f53b1aa3e38---dolinijefaxeduzawigife.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16119716695990---fijetamozi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b954585c1---nutelanunefuzoxazepe.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/smrir6990b9gh4nbdpn1c3pgnq/vebogepofodukanilofoxiwi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16114638410a76---24914305735.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2beb83ca5---vasadituzuzibu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2eeee8faca62a52980253707ed8bb3ba/66173900006.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d604ca752aa6a799d5176c3c0e7a1fcc/xijamasivavofuveg.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/667cnh6290oi292ose7gqfd6q3/54836117440.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5f9544fbe25771127bd607e2460e9b5c/zudafa.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/182ba059f598e2ca8c0925548aa4e50a/zuwezovutunobujitirubax.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/towatuj.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/99405f988cc3c75bdd9ba703c380471e/64751840364.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc23b28c16d817b6a3a0be3b0595fa83/42964535946.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160808bcc60fc3---85028450480.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/wabupevokodupuzufotejuwi.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210604182906107137.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/48529345651.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_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 19720 bytes
SHA-256: 813f2965edb5aacb1f7b1b7422fcf8d52b1173e074de91bc9809befd042525be
font_02_sfnt_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 11400 bytes
SHA-256: 5222f5bc9815d82d3a9a28005f1fda2063ec06e6d73e0cafd4fafc6f13ec6b8a

Open this report in the interactive analyzer, or submit your own file for analysis.