Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6c6e1cbe25fc0b…

MALICIOUS

PDF

92.6 KB Created: 2021-07-05 17:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9b954cfe8bc0f96a9b87a79998247f1 SHA-1: 1fa001257217001634253909685bc52983463791 SHA-256: bc6c6e1cbe25fc0b1cb4228675f710994db9d7b040621f5acc62d5d19fda0eb5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress upload directories. The primary purpose appears to be directing users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c264f307c3b22bbe765f2e28fd0b2527/71421097184.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/7fdb17d5c4108de002483db2f24b8936/5932232481.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9b24b5ce150d814c426d208be6f2679f/23153309349.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2fe479a14f247278c16cd92103075382/xomavosetoxezamemaxijas.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/iuffhq9bgorg25bsdc45g515gr/kazeveso.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nipufaveverevajuwe.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/11698378805a7b46eadb4be993eef400/nipokubobukog.pdfIn PDF document text
    • https://duzcanlargroup.com/Images/Media/files/74011828500.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7946c78523---65101431215.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/r8vtnj87c7jos38qrat1419u74/sulovukizerikufobokav.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zejepix.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q4tam9l9avp74n5h22is219bu5/28617588099.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/25044028688.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b73dc50c2---zegikobizivifi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/28167072678.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2uq81eecri3p5q6rrv2ugr5hn2/93871975376.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///83512336989.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78e32b623---27481120448.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f7c158e8---fakekujemiramegujigef.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094209259b---muvakopenumofimetimud.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nadesaturevuwopadaretu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8acdab1ba---zinosuxobesuvusuv.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c9dbbf15---gigexumotujor.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/88887703197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+rise+of+kyoshi+comic+read+online+freePDF 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_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 17276 bytes
SHA-256: 0bcbca366da09c8048dbf4cfbd4a238cc819278d686f1e66e3a342bcfc7043fd
font_02_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 10812 bytes
SHA-256: 95ceeecbc4be795bae46eb48f408656d3982870110717da2a07c0f6e8a1a3799