Malicious PDF — malware analysis report

Static analysis result for SHA-256 9139d7018545d7b1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 03:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97bbb6c4f090b17d5050c547b99c7f32 SHA-1: 0a18b318899ed270572ed0cbf44144a03497b0ba SHA-256: 9139d7018545d7b160eb77542d48651f5ff62c4fa397c3d8252bb07b51203468
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bushregenerators.net/userfiles/files/6217725447.pdf In PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/14169477072.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/nerofebakudivoxor.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_25634_101.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nopafafinelolivuninunu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334131120fa---869979470.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/56925872191.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/gewajapupogikanulina.pdfIn PDF document text
    • https://anup.bo/images/files/kazirewexevusixerevesaguf.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/90475026638.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/st54c5g1khcpf0u8qbrujoofhd/labokabu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mumitik.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91887331946.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2a90be75edc710b05dc3404f5a104e39/wejopajimagaginolul.pdfIn PDF document text
    • https://somogyplusz.hu/files/zunekidopijal.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/pekawowenadutupoxedilaka.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424de242fa3---fogukiwalopiloxivekij.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/kelane.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/22519932818.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613913ba61dcb---pekebofimulij.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/22578191482.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/48146222029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=apk+scanner+appPDF 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_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 18836 bytes
SHA-256: b37abbf7c2a4c262d6084295c4015cf30a34f159d7547a3017794f9bfb406496
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 10084 bytes
SHA-256: 1389aba291430a4ed5208104ec0a39db28a45d7b1db1cdf1f94427b7ae664100

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