Malicious PDF — malware analysis report

Static analysis result for SHA-256 5977076281219c39…

MALICIOUS

PDF

81.2 KB Created: 2021-07-05 07:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 99579cde62c8fd52a03d9b849f1595a0 SHA-1: 2bd5a42fd3f440d5ba794c5b6c5acf4e71c39edb SHA-256: 5977076281219c396e7f50cd8f9a193c8e49fb72581c747a65df98dbb97701a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://armenia4d.com/contents//files/10466581131.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/60bc886496bc325d0f16a10b1123e16a/wafisugisasawisiregovajez.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/83b01214ce97e1fee0127ccba1a3d39e.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/gm4l6ksfush7m3ksavjtas1tek/18316756921.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/fetopotov.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a087137cebb---71536746140.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/vibituxonumivoj.pdfIn PDF document text
    • https://stvorki.ru/files/file/16173500982.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/598678fd34f31204c45935dfeb340c31/xaxogurorofala.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/70193911271.pdfIn PDF document text
    • http://canvangdientu.com/images/file/55060550684.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29dcc93ed4---35599388326.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1ef14e1e---mobof.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/26649028835.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/18ab229ea8dd76595aa99a7cf6ff57be/99929680494.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/aa6fd7492865ca9c06acc7a4d5d5efd3/99103815553.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a617203956fc91d1009fdd4b81ac2c43/rulomodij.pdfIn PDF document text
    • https://ever-progress.com/upload/files/15908839173.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/visinoxepedefonipaduwa.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/16449527772.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/5848750328.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d19f23950d8b323d48930403701f8eaf/26302488423.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb21e4c85---zevawurezunivaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=crater+definition+sciencePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10456 bytes
SHA-256: 5f9ba4821978557d7e3878fe92d3dc1c286046145903d27d52f7605e13d1c242
font_02_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 17084 bytes
SHA-256: dcce0a5d1fc6922ce0eee256271e10bd0c07078645a44e98674a391a0a1f2e1e

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