Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27c4cef8f5eb0be…

MALICIOUS

PDF

89.3 KB Created: 2021-07-29 09:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e18d0dd29eef04d680aad2e6861f94f5 SHA-1: 0897edce78c4a696d9e76c5229fd713936174327 SHA-256: f27c4cef8f5eb0bec8a2fdeb564fddb2f150a7d3dc302af993e7b9df6a8be4cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and potentially disposable hosting, consistent with an advance-fee scam lure. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/57d50a0d869e6f54daadddc4c0311146/73711130063.pdf In PDF document text
    • https://bloomeng.com/uploads/bezagilatenitaf.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/veforide.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/84966309310.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53a58e018---26977532621.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/cbcc36ce1d91e11b7f29e655f3932aeb/mipajasutuli.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/sozaxukedovatikev.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://kulturazebrak.cz/userfiles/fojenugululafud.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8i31absdqp70eiivib36dq6pk9/66007783892.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/19333894918.pdfIn PDF document text
    • http://whatdwellswithin.com/file/fixuxogazajuku.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/24610535705.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/goxenedikutin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b647ee5c3---favul.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/87725910158.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nupewukixetiberugorasid.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a2887acb6---vibidolali.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609afeb9aca84---27535110617.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jolavova.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7dbd812e---toruxab.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c8aea76b2c73f488f64b5c8e2c3e8562/6746957141.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/84637965922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wedding+invitation+letter+templatePDF 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_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 17040 bytes
SHA-256: 6580c68b6056733d86e2a622d01853f507b6a12ba23952f1173a3fac0c21a10e
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 10628 bytes
SHA-256: 00aeaf3fd57aeea046db4bd6bbc6768d34fd5f39f0afddfe8349d4636fb89477

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