Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6de0f76b644420…

MALICIOUS

PDF

113.5 KB Created: 2021-07-20 11:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e5ccf19798032c52a2423c43f80d375b SHA-1: 649fcec36fa5b60fe95b46cd24ff3eb0a83bde00 SHA-256: 9c6de0f76b644420c4e60a05bcce6af84c546fcb21985cb89372815e62123745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mvservice.it/file/dabaru.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607355192bc6d---rabivudodoxumerozedep.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c662dd35f---32597535643.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160738053bd3f6---liwad.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2d3smnhagublnhkqs3ec28j21o/97198417545.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/delanorusozijal.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/tuwarine.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lbe71v1d0svgq2ecdgschpdb73/38463654585.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/27332f03ade98bc1f878c3a1cc62e470/83183276005.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/suragalek.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/ralor.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3q2f0pvu77ceo3op6pu2epnri7/46259501241.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607824832cbbe---3943674769.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/fidileripilolur.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/60261828944.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b9d68a50---zalabidozukiwutuv.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/5589405753.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/nozaxitidagejagiregij.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/334549d7453e15013d3c3af0b9d7a989/koxufoxesufuravegejoto.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/62d51350909cc20f26f00fa4c93ba5f6/vejamesobupe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21806393621.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/416f86847bd6d20b88473927b652ee49/zotogufidujil.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67ad4e1426---30722975132.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mofilefedosujalunesojabol.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/63734959761.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a223b83e363---10842059410.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/zavam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=1969+mustang+mach+1+fastback+for+salePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CE 11312 bytes
SHA-256: 03e1b6f755696b000c02f82fd6d51cac304ed430c0e1aab06ab28cc86c2530ba
font_02_sfnt_off00015f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2F 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_03_sfnt_off0001692a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692A 21552 bytes
SHA-256: 14b42147f126e8e4f8c3bc523bdf2aa753c96f3d2d8c5f00081bbad883d1db6e
font_04_sfnt_off00019fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC8 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d

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