Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e903c96215db07…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 21:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ace7fbe3a8e61defa1aba4341015c180 SHA-1: ca254440ee8fb40aac24a7e778aec2d0e3554152 SHA-256: 62e903c96215db07a9243d4135c2d5971757be5093142c14a3bdfef7cc81e2cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users into clicking malicious links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/68b4a85202bd7d175d7e0485cbf4a631/98067569344.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/b1vf7v4lqg20a02sppfgrmglq6/wowidod.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/54653820572.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd92b09f1---69429041540.pdfIn PDF document text
    • http://guowangcable.com/d/files/75378093442.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/416269ab1ad79ba5f450fea221be3761/nusojomanuroridesonor.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/geluwadukonifen.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fasodiforufovekede.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5904c837---40137463957.pdfIn PDF document text
    • http://soupworld.de/upload/file/tovofisopodezix.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7o7qp3169ldmvmahruoh3qgvu0/fedov.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ac9be1885---86937854142.pdfIn PDF document text
    • http://jngf.cn/files/file/93974505409.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/tabubiwuvevukudunuwide.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0de9c7c96---15260435906.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gixipowiruxesilu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1abec805---vujevij.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/75016878096.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/be99b69d7e081f5e9ab0853d7fdaf793/lolipavibarebe.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b53ef49d24cfd16ea0e9f4d95dad2d0c/93901820824.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/riwojaxikepel.pdfIn PDF document text
    • http://learningkey.org/userfiles/45243963995.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce8157ebc---30444560151.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db59bab5da---77297472158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=need+for+speed+underground+2+one2upPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10472 bytes
SHA-256: eee1eb0e417d57da9889e234d498502ba73cda51d3294a77472ada807c60a4cf
font_01_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 2972 bytes
SHA-256: cc3df57f80808358ec12eea98f57041b67e86d1852e0bf825fd18925e69a79d8
font_02_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 20020 bytes
SHA-256: 1c772f757af009c4a0036fb7ffe71f9d2d6108b3f0cd9be40ab0bd3281881658

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