Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4305342e41df311…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 20:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 592244ddbfc91655c6e3f87c5a713140 SHA-1: 6e576d13093ecc011d0f2a2be46bca2aae525280 SHA-256: e4305342e41df311ecdbd50a0e3ae37aacaba3cc9ae55f80f791be9eaa05b530
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristics identify it as a link farm designed to distribute files, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd2d911169---lufajibukaluzamogopowuwa.pdf In PDF document text
    • http://optimaglobal.net/ckupload/files/74046097120.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/sisegiwifijaderoba.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8ne3doe768n224gocs3naa1snk/8318938056.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/peluxitobib.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/57212855657.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60015082001.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb01cbf7c2---fuxup.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/37621b0e13036e12f28e4ef2eb646804/62317964632.pdfIn PDF document text
    • http://agavietnam.com/img/files/27559128915.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/fiwowogemame.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8ki45rcrg6lm6op6h0j5ris9n3/novugupasa.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gesorefaforozuluremeke.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0bfd9172---nuwazapikoxo.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/46823622835.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wowemarulawidaviwubowoxe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/92715447531.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/kikukanesuzof.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/27514527113.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/vixisoladopitoneta.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/merobixowezumuro.pdfIn PDF document text
    • http://ahchala.com/img/file/88711548747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=physical+geology+book+pdfPDF link annotation
    • 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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 10944 bytes
SHA-256: da18a3047013770f54c88bf97382e92f41240d290102f5b5804dc3a5bf611c7b
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 18948 bytes
SHA-256: f69239002ad8e250997e738afd2f1ad4fb8f20aec6853a635e7bb145fb2d9b5d
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1