Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab7ba5f735ebafe…

MALICIOUS

PDF

91.8 KB Created: 2021-08-10 14:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 002e5e5dc2c47c717e1eeb1318772fa7 SHA-1: d6414f96fc1d4679dd65684bc2bf818a1b64251d SHA-256: 0ab7ba5f735ebafeae3e0cb2a1fef7cb318a8164a8b3db86c926fcc264649f1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, providing a password to decrypt it, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hpla4r1fjlf9d2edp36q2vegm6/kagimitiminizowururu.pdf In PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/61634095507.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/moponaxi.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4utl5jlk9058kkvnu9jp6a12in/41589772076.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/73279913697.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h6baus9bihsjm4me0k4js084m2/62157253974.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b3830a76---75878980369.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f3e7bf889755848b7940d0481e186174/11040755981.pdfIn PDF document text
    • http://someteme.com/archivos/_20210618023605.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70c04b6570---83428272736.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2ab76575e---sapedila.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/38802939325.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kixezevumevokure.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/sixewixododo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843534c1e9a---67880188100.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/16949601310.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/93054719151.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gizejigasabij.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lamelalevipipawekexu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0672d93796---jeluponokujigujubuzofu.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/47512627050.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0889f9d2ec390677d54427d74f7a0a5b/12502979124.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jbrhkv5dkt13fqnkalub1nia8s/lidakuziwefafike.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f0ee0e4a---42764650743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+jinpachi+in+tekken+dark+resurrection+pspPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 17564 bytes
SHA-256: 64d56ff8fff0b0b02f4af41e60c5a03f5d02a6f871ea51310f06a4a69c378901
font_01_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 11148 bytes
SHA-256: 450694e96177fa0890d736ed7deede4f17c48af19cad8fa41810e878afc4e691
font_02_sfnt_off00013cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000154be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BE 2144 bytes
SHA-256: 15cf0eedff41921d6fa0017e7f7317768b104473f6d22aa261b335db870fe842