Malicious PDF — malware analysis report

Static analysis result for SHA-256 83237fab29e45628…

MALICIOUS

PDF

93.1 KB Created: 2021-09-03 23:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8f507d25ca3bbdad8d35a82332de7c7 SHA-1: 9640eef7d429ba17274d0b81a4679d5383e473ea SHA-256: 83237fab29e45628203ea628e79afd258f7f19f240849fe926820edb557f4809
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into divulging sensitive recovery information. While no scripts were directly extracted, the presence of PDF-specific heuristics and the nature of the lures suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://abnicum.ru/files/file/rulidixuveguj.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/midojudotuxoxo.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kogelapabowaki.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16127642a218d8---89133202842.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/omnfpuvbnor4cklh4vrbmnelth/49195169206.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609329a092083---jejop.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/134feh82urt4gf8jqsbblkhck8/1859925692.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/lakurid.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfjca042dhhapnkn2dual4nvlt/sifapakigezaposeruzi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/otmflpjgal8j4g1lgi9igktm99/waxisutefozuw.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/vunazanufoxomivubad.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/gitom.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sibiwogadaned.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2cc31821a---vosuwebugapifetakuguva.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/62b59696ec64173defe2b9e3d52289a1/kezifeseruxaloda.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tjk5opbjdjqvhiuscjhddaqc9p/22697303652.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/vevapanu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/58090450931.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kixapatutazo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/eo56vdu40o3fk4351ld7mq2lmo/45498750729.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b11032024da545dd13832526f349eec6/migezule.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/gojadixipotudo.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/sekewapenevif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=medical+transcription+sample+files+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/03cbdaab4fde91d48dcaf099fab287ca/wutibefivikikefa.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/gilujelogowifomafogiwinog.pdfIn PDF document text
    • 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_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 19200 bytes
SHA-256: addb343c098df915e498491b94c29377e937f74e0a4cc51a4d5f9535e51f518c
font_01_sfnt_off00013546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5D 10772 bytes
SHA-256: 142889a2870eeee6d378cf2254ad79f15e13044c04d0490c6d3b6fdf22f6f451

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