Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de9937322f82e1d…

MALICIOUS

PDF

104.3 KB Created: 2021-06-27 18:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3e1296d8fa92363e0a136689c9d16b39 SHA-1: 6058622772615e0b4acff9fbef01930776fbd62f SHA-256: 4de9937322f82e1d3c47342beab84eaedf1764936e987c0841e16d9880a5fd0b
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to direct users to potentially harmful content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5fbe424c---bodixogemuvibuzumefud.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e8c02ca5---96314382797.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/97a9c16a4034b0cc51e74e3334f4c5a4/98464966515.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d68b66e6f3a---vumaxizurise.pdfIn PDF document text
    • https://energooptima.hu/upload/File/32462184848.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/guzaden.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776371cfe2a---jesasubugolokivuxiri.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cd0307b34d96f08fff2d274b122d2816/sagarelenibebe.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f11bd2487---59106085097.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/360qr5g2pi8s1khuijmn5r3bj5/19690703693.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/gelen.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lemema.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/85349266858.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/lelajifasesolamurugoma.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400dc6bd6e---joligabukevemezabu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c204f473029---wilenusar.pdfIn PDF document text
    • https://bataretak.com/img/files/file/potiwuxitekonavonegat.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nc1i5depbv81cn2tomr4tmib1f/81492837064.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf56c8fb88---xupopaputolugi.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kuxidolukututasopor.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zipetenurejeluw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a24c1f45d78177c0448693adad7de3bd/71709155495.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ce7f46496fc8b51e614d987c66ac66fb/71888947273.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429042611621742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+national+sport+of+canadaPDF 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_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 10580 bytes
SHA-256: 8c3ced639e9f472ed9ba1d32056e90a01cea33b4d24503114fa935d4fd0be010
font_01_sfnt_off0001503a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684C 17008 bytes
SHA-256: 39392902adbf1243427a69d01f8602f13ad29e0813d20d3773bac29c5e363e6a

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