Malicious PDF — malware analysis report

Static analysis result for SHA-256 455674a97d183702…

MALICIOUS

PDF

125.8 KB Created: 2021-07-16 05:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cfc6e8aa11b71129ca746259f15d4733 SHA-1: 11a8c3db054c40c1b54cb4f1843ed0028869878f SHA-256: 455674a97d183702d282ef9e40199a76717e3094279a9e4719d8fe0fa849c91a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4a3ed39729e65e8aa14c60d67e43e40e/38379531505.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fd86ce922df67abcb237505459391753/63908331141.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/11855ba2d6b407169014c82865fc937d/pinoxiponotufasaridifexa.pdfIn PDF document text
    • http://hevolta.com/upload/file/ponilikudafid.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/69ee4fe43eb37b5c50a65c4e75047c06/91338656916.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/kigigume.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/87744803939.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e7319ca4d49c82cc68c06103d78e3fba/33838595060.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160943becde3f2---vonedawogojikawunulegosus.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/89346451168.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da2d1bc7d---20082017946.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa7cbb0ab---34835007544.pdfIn PDF document text
    • http://szwygs.com/upload/zorodusonajufofilaxe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6865529ab191c2c0fe6742407f4f2bde/99555376362.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ba1b56e432a4693006ed615f2c8dd9c4/legelobebexip.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5a3ebdd7428c87d56f2476eeec0b0c42/tudovufomalotidapovepek.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e849f642e2---57706505974.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1434073ac5---31909790077.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a879e55cbee---tedawanipiro.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096012f02571---dadipolaxejepo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ae6329c6430d6c73ae88a2cb77b817b2/fatafo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed5723c83---demipofive.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2167699e8b---lunejuvovavewedagub.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e8a18681e---31329700517.pdfIn PDF document text
    • http://momsystem.ru/public/file/76327818023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=henri+matisse+known+forPDF 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_off0001876b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1876B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F7D 20600 bytes
SHA-256: 4ca1ee08645db63069a16079da41304b22db2d3fb306632648a1b42785870080
font_02_sfnt_off0001d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1E7 10496 bytes
SHA-256: adbaeddecb62cf6503b2017028803c0fc256b02669c5a1bd45f8743b388b65b7

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