Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b8252aa303fa76…

MALICIOUS

PDF

88.5 KB Created: 2021-08-17 13:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a96bbca73741559ece7fa4ce40b8c77 SHA-1: f2e892be3594ed8506bdcc706f7ccccf03a6aef3 SHA-256: 20b8252aa303fa76cc0da1e5bb934fbcf54b7a1a99aec81dec3e6ad066289adb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc8cb4f77---jetiva.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/13848542483.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/70507f9aae68e24732b5da9ac67a8f57/zabalajavofogujabipi.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/7712348088.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/repewijetajojogozem.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f455d16efa---kosunodamudopozemif.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/kitosowofi.pdfIn PDF document text
    • https://datawire.gr/files/files/73548961754.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ptkk737s4qs6pmt0hljbe4v3j9/rodalopo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/31e1bc4efdb26c0f5863166effd787ec/80532404298.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2bbcf8049fee4d30d4537a338e6d8ea8/dalilejamoli.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/46467329752.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/1161653498.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108070357457654.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///40684400705.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1441a32c---59394922037.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/97281872916.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0vuuaepb9pt3ecnk7hrno3kaj3/fudawezojobubiwuw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/fea9ed432ecdaa47a62a1a6aa2ff0080/4555423465.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/foxikujuvikodugejogope.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbf39ba53---masodakimufuvasi.pdfIn PDF document text
    • https://doganagolosa.it/file/30804432739.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/finopolofet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=whirlpool+water+cooler+stopped+workingPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/18bf4bf928763cee787b28c377a9b15e/4395400353.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/bexapifebalejuf.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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10964 bytes
SHA-256: bf0beb5ece0cdd73969ce85e51f9c3d2c6a95984159c1ada1c5115cb9804ab93
font_01_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 16740 bytes
SHA-256: 81c2d9a06ce53dc9dfbbd05253dd94aa76dd19d50d59d9870e3ac4eec872e58a
font_02_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1