Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dad9b33f6e19c5b…

MALICIOUS

PDF

85.6 KB Created: 2021-08-18 20:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6218574ac2211a77476f66a5ff5705e SHA-1: 7f865456351354c9324980d3ed74248f9565e360 SHA-256: 5dad9b33f6e19c5b0b67333656db4ee768cb9384729384b0bddee92699de2b37
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised websites. The primary purpose appears to be redirecting users to these linked files, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/58595107351.pdf In PDF document text
    • https://civilkontroll.hu/uploads/file/repetikumagatabironux.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/61849281839.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/70029761443.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606db8f569054---66194100472.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b10911ac173---xutewagegubiramu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c67722fd0b---34765086731.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9b22a067---juxigigapa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12ca2c5e8---kukabuvarajoruzovetunine.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c946c48ab2---60401528012.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2uibf93mv7ih28n07pk341lkt0/mutulobivixifis.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/7054984722.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/xexoravijizefiju.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/89681713113.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e5c282304b732630491fa05de78660e9/welewamene.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610f91db4f121---72841299223.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/77143195283.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/15843909311.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7f1e0a2128018a772affd6cd28bf394d/niraxigenorakesifuzubir.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c31ca19a0---bidarugajetarin.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6efe004474fabc57f94aeadc109f98df/73937159222.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/458b6a1ed9875545c1268c9a6c955031/nojobofakuturaj.pdfIn PDF document text
    • http://accronline.com/userfiles/file/81771083451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=modern+portfolio+theory+markowitz+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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 16880 bytes
SHA-256: 8c5bedd99e247120708db516c228a5eb43c19e0af87190a2d8cbb8a2273c9a33
font_01_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 10940 bytes
SHA-256: 722b5ac491314014c5f06863343c2dbc930511ecf2b3a16db28756e9bafbd159

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