Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c8461ef561f323…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 22:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e12357b11bc5be5a1c10496f1970c7b9 SHA-1: d3de95537c8397dec7f894292ef8db05c682412b SHA-256: 06c8461ef561f323a3afc6b0f756102789fd96a1161a170edc91fe6af5d68015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The use of compromised CMS uploads suggests an attempt to leverage legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kaptenhoki.net/contents//files/refamesurarelubexop.pdf In PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/94931296948.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8njarv84krsv9234vrt76h6ml/movoj.pdfIn PDF document text
    • https://atiksigorta.com/files/mawinotorapusaponazalu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2da0150e---40788504378.pdfIn PDF document text
    • https://hgb.se/filer/file/zivaxag.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba8646ed6---koxibojefu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o0r0o48456l26dsk3126b2e2l6/bajagas.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879afb2c0e---zelomobajodadutaku.pdfIn PDF document text
    • http://nktrading.qa/file/files/gagizipotuwogi.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/64810396953.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/30365154568.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a4264798a2de3051738f673a0c735b43/xevabun.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/22385396098.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44cebbffdc---purebamuzekukaja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39cf657954---liginu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8dfb8f90c---12521320776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=deforestation+in+the+philippines+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/48246058055.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_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 16800 bytes
SHA-256: 90a9b4df83b4b607115de1769c7ad575b642b3cebb9ae3d00fc41ceec6adbf29
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 10596 bytes
SHA-256: 052f498104177901de402265ddac12f4735472ac67c163239fa7c85227a13140