Malicious PDF — malware analysis report

Static analysis result for SHA-256 133550f376c95038…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 872e5752aea9fb8f1163e598ef10d7d5 SHA-1: 7fabc6399833873cba040cb3318df9b8ef870b72 SHA-256: 133550f376c950381f2bd240f0977fa581f41e1b0d4cab7b3d118cde061a6584
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are consistent with a spearphishing attachment designed to redirect users to malicious content.

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://cristalparkhotel.com.ve/ckfinder/userfiles/files/sazixukiregoxij.pdf In PDF document text
    • https://tahubunting1.com/contents//files/936499873.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/nobisikusosufifes.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bukobobozowazarobo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9888c4d2cfa2d4bb14ea707af095b3e5/2721956176.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/22872003434.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/61038862280.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/815207q385pc3n71ls0djc2o2k/88362843522.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646e6c0edc---30415251344.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/nitamedamu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5d25834d---19209137176.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/99986449252.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812b8f92907---pelatoliled.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/54652144264.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609225d9898c0---32881215033.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/tagipiwidutatuxozuza.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-8/20210808062510310419.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78a391f0b---83171431621.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/212021251244.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/jurasizojosa.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/93778910958.pdfIn PDF document text
    • http://hanleyresources.com/images/jovegupejuledovuli.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/53778356588.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/xoladefuwibewakud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=polyamory+weekly+user+manualPDF 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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10472 bytes
SHA-256: 87e605f1d8f57b2cb326623a170604f869a9e7812b34362e3487e26370749658
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 19624 bytes
SHA-256: 45d599faaebfb65b859aa6dbfeef248c5a533cbc574c7960b7094116a40920b9

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