Malicious PDF — malware analysis report

Static analysis result for SHA-256 77697cc9ac95ee6d…

MALICIOUS

PDF

117.6 KB Created: 2021-08-03 09:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3afc3a9c24254fc8febd981ef746e602 SHA-1: f26d01e0a544b2af1b1884f35bcdbb1b767a7a63 SHA-256: 77697cc9ac95ee6dd3196ce5204ec9c789692ba3fd0a3fafd7462bced66f00ad
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to external resources, many hosted on compromised WordPress sites. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring users to malicious external sites via these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

Heuristics 6

  • 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.
  • 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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/17139d20c3478a54fb4352a51e3a2cd1/tujemapowu.pdf In PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/67717562723.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/41137558405.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e7cb2981---sopobevegojerixerasijomi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160871ec9c86c4---movex.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/meuu9rchljgfg2ouvs147rc9ai/16193946831.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a6254b27---20980730982.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3719a8e367---67118142158.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c9879687a62447d2b14666d0338fc202/luwikesomunulelunaxafuwe.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/80322545908.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352c7cec47---xuxux.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qus33splks9idebm7r9jjjth74/14137606975.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lu5ksjfviqdll3ig3nsjobp4hb/73753348675.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/kilomefe.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8dc4d869---91937633345.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d34903658a0e358147fc6b0a1c7c2d19/66478856194.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kaxekokudalaxonudabukarek.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/63378297145.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/41175614528.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fd30ef17a56e4bdb744fbdb60340b226/31808825230.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/svb8k109v27h8q4sl2bg64n4b8/luzuf.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b556d9e281d5db7045849308411bbd2c/mopodunib.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/puwoxofurigibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=escala+crom%C3%A1tica+clarinete+posiciones+pdfPDF 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_off00015973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17185 19508 bytes
SHA-256: dc97f54aed290406e049a9c501c5da4330056e181fe3e3925e8b315adef0e4cc
font_02_sfnt_off0001a322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A322 10944 bytes
SHA-256: bb8a5a3bd94a86e6712e639fa7af1a3b2351cc8cebe294a54a2430f923fbf384
font_03_sfnt_off0001bc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC0A 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24

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