Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c5fdd81a704067…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 01:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2bba9922d93125866eda18cfe48e3d0 SHA-1: 7d91136e639be0335630c85468b19064062d50b8 SHA-256: 50c5fdd81a7040677438ef0163ea93fc649dfa25f9fd207e4e5d4f22917676a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used for SEO manipulation or to distribute further malicious content, potentially disguised as downloads like 'boruto senki apk'. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=download+boruto+senki+apk PDF link annotation
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/898c034690346d7d0d9714efecc33bdb/suwuziwugukilufelanu.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/pasegijonatomuvukex.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/wosibibakitarevadu.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/32506148561.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/57207574262.pdfIn PDF document text
    • https://sim2007.com/files/defudojiwa.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/78692311255.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/95393754335.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/51249873772.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/76277279151.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/kenopugas.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907010357.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/xodozif.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/38846633925.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/16077438424.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/51152880379.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144cbca6f881---14608922809.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/25693493516.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b1d939b180628d45bc22c31fbeb17e/kotebobikosagi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9ebd2ce8e5e79d8b4b84de545d375203/26244576029.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/17350541528.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zamewegoxawep.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e15a6df9c---kirunonenodeketidasareder.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/476ae18dbb8bf2054a15c026ee063221/menasujatigupoton.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81070589597.pdfIn PDF document text
    • 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10804 bytes
SHA-256: 952be0b9280703ff230c25027a578c50bf4425760a9735b5a74b9c9f134da0f6
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 18552 bytes
SHA-256: 2039be8b37f264f20434cd1dc771dfef43d2bf32a6a3e373ecf2d91fee1570b3

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