Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d74d3e8c7bc1ff5…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 01:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a5e20c17eb4681d74d4722dffea982d SHA-1: 71665dc97f4c4fd25ea12ce0e2322c73893eb1d2 SHA-256: 1d74d3e8c7bc1ff56a9ff3bf91efe890aa236c0f2d0e5b980f8b079df4d7e5b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage redirection or download mechanism designed to obscure the ultimate payload or destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/060ab3e53df0452024c962c9f5052a47/87847627348.pdf In PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d5557e50805f657c4c7d4f6fa226fb82/85608762930.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pa3phs713ghqg9s9u4mim7eib6/49997324399.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/74openqn8bot5673d7uae0f8p7/54814524361.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/vimebuvusudigex.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/65223151403.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/getejipusux.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/371aa1a287062b0170e1051760ff535b/rezarigaravix.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c29dfddbb3f---78947006393.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160876d85f3fb1---21009298784.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cc6d56169fa4f1251dd9220555f38f3/24220207815.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c03ef43b---76169662069.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4aa036347b5cb63c1b4ca656ed4eac73/sovasadimobosenajaxar.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02bdd0804---delazekol.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/efc0652e4e9e6d0dbb4d5da92c548301/56899293154.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7548f43053---rarawuresubelite.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/1688997655.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/42232095745.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fholp5bfcuv6dbqo55t2isfp5/33742408738.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/1b63dbad7a61f2d210b80e0808aa5cba/vabanoxenoruwivomevareguk.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/44477782436.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6429d17a---mavawif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reacci%C3%B3n+qu%C3%ADmica+reactivo+fehlingPDF 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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 19076 bytes
SHA-256: 1e136c32812ad60cc3ab3f4b231fc17ff2da4b9c96954f4ff443a3962562bd27
font_02_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 11172 bytes
SHA-256: e6d007cbc207a443d965fc098ddb31109559b3bee2a5d4a74e31fc32a2544c96

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