Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d18bbf0a7b490c9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 23:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7da6baae7af1372cd310b5d3ecf32a70 SHA-1: c06360f9afb1e4914f8b88f0f90aa03192ce4457 SHA-256: 6d18bbf0a7b490c99114ef70d93711f4f092dc0508b916241f07255a466696c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were extracted, the presence of multiple external URIs and the nature of the heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://jinistudy.com/_UploadFile/Images/file/84940856181.pdf In PDF document text
    • https://bczenekar.hu/files/file/sufewobox.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078444822332---lalarekotalexubebanef.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/27328643468.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nakemakezaxazapadule.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac21e59ebe---5433501561.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/nokixunapisoxufo.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/47012410287.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/woxasuzol.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/922a03ffdea42379814eb416cafca8dc/80798397300.pdfIn PDF document text
    • http://minerva-collection.net/files/files/dalujazopopuwodoti.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/megipobofajutoxup.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/robopomitimevifuvedijixo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/faf9c4f8e2795c9a6b32e99f86cec787/bewugiked.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/visawomotuk.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/88510163594.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9fc04d4eeb9fc6c69d808b8b0eb8ecb9/79059961640.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/nifekutoji.pdfIn PDF document text
    • http://abc-tel.ru/data/File/87858475348.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qapvgnjeoapntnmqfjulnmn5u3/38861629990.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/47c8a20162b45935e737ae3e1d75ef6b/fiwenodowul.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160960f92ab861---kugav.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/tivon.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/vedapilaj.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/22ce0589ad144e887ba470fb1cb5e2e1/vesunodezovenexatat.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/del98ojoc9bj9f8l2jdv2mrjm6/kopuxamutoju.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/31457330956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+classical+literature+pdfPDF 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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 18192 bytes
SHA-256: b62bf1d34d6c787450f76a729a8fe7e3c0082741e091721888b7b2d0647bd625
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 10728 bytes
SHA-256: 40130282ac13da166445bc81a38045d0e83c3e19dc8bddf49580ecd8ecd1fbe6
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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