Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bc4b92028f571e…

MALICIOUS

PDF

89.8 KB Created: 2021-08-10 04:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c1d63bb19522e7fc82ed2262b3b5029d SHA-1: 3c6cfc3892ed687b873f9fd53b87b3bcd546a44a SHA-256: 87bc4b92028f571ed4d5f231f9a8c3bfbc298ae7f686165a670f2c7689090030
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/641b868a0dfbb1ccc16acf34ebd5b5d0/xotixapavuterudosabag.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866bd5a139e---39056832969.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/wipokit.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/rubixevuvipepojakubaveti.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b51415d4026---muzekozub.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/dagirovozoje.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/39950212424.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/17790658204.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/52a9ea7fcf999eba113758290a012eac/tojumes.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p39836a6en6gm3645f0h1e9ts7/83035868372.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebbcc5597a---peralajatezilugizagalamip.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/om4sr9a50338123sf325jqf1jk/bemepuzalobarurebukosufiv.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a411afe4a---vixijilubetixofibole.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107393c822d9---fulolavi.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bevejodizaxumalok.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/292203541016.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///jijin.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ba7cb1861a2160a1f64a1ccf0fbc4b97/31361128802.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/soterolibaniduritepob.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1b89bfa81100a1fb831a11370ba7767c/tinesipejorelukezugipami.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/satoju.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2987fea531ca5794c31212836e435141/ximipu.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/67520051282.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/53357949902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+detect+nmap+scanPDF 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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 17820 bytes
SHA-256: 8d43dd99eac576b543c0d1e8d788b5a3931a15ec1fab5903625f00a9730d384f
font_01_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 10516 bytes
SHA-256: 26556ae664d213a1c024d44ea17e4c9ca692b2523589483bb8738598669f31f2
font_02_sfnt_off00014193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1