Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bd6c671bd96018…

MALICIOUS

PDF

82.3 KB Created: 2021-07-18 08:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 66cc87c97414fb8e0144d8f27f2ce00a SHA-1: 83d612e3a16125c46948221512b6949ab5523391 SHA-256: 54bd6c671bd960183dabab16e4ffc6e58fcddb728077440e23c747cae9fbcc58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tischlerei-schlusche.de/sites/default/files/file/murejalu.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/130e8ca2240dd3d03f8dd1b590a296d0/17506081923.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/gudeganopedetewozufe.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4943d110f---netemuwona.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb4c47536---49581112494.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/73581685647.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/92cbd87bc40a3f7346d88eef35f6f6b2/34047292364.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/70415991516.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/gitasidisubosojodizaf.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/76617426378.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/91238406204.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/85608000427.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a299ff618f9---ribobovatorolexulavifoji.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6727c28---zojezewo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jorewiluvibixukotuxo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/musifebuzapibajifupumiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36e0c6ee6---lanuwopexibidafi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608185c07af0c---42941530408.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/66204532698.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/24b0e06072bd816ca570400eff6d4a07/butogirapagoder.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608378d346532---liwifepewuxarepuxulureb.pdfIn PDF document text
    • http://standardamulet.com/files/files/46686394268.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c42d4442---nodexiwadetek.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/mujaves.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/49167921830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pagemaker+7+to+pdf+converterPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 17096 bytes
SHA-256: ffb4ec85127686972f28438bde3083be53d378261c8afaacbce083f50851b501
font_01_sfnt_off00010afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 10868 bytes
SHA-256: 2ed56dd175d497eae090dc10c952a6b0686bdecc0c153dbc309ae11a31a67733
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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