Malicious PDF — malware analysis report

Static analysis result for SHA-256 5262c044e3fb3871…

MALICIOUS

PDF

150.9 KB Created: 2021-08-04 05:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 40f9584dc9db81b30cb427b746a82339 SHA-1: 102730a5179ed701f898c721f07d8638e3809f3f SHA-256: 5262c044e3fb3871dff56e5f24aeb889323c59a0f8cad2d6739eaaf16c991133
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://designbeginnings.com/upload/file/wigow.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fe5ef91---bumojavenabomade.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7a5f2e10---50184775732.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/776a0458e752d273d58802e64f62bc1a/jerilojixuza.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4c3cadeb71ffad35e04747f5b4ec8700/sexesalemefe.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejqbge4b6mhld50odsilnm7ffc/rixatop.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/81148561143.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079325415628---dukodisaweza.pdfIn PDF document text
    • http://naviway.su/upload/files/72579762101.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/44463425347.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/ruzevimozimari.pdfIn PDF document text
    • https://reniuved.it/file/20275856365.pdfIn PDF document text
    • http://skupka23.ru/upload/m/1957125389.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kuwegata.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf7c8c74---ganepuxakosodovoxexizaz.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9fut99asmfcvvbtb2gqbe6k5bi/padigitanewamisa.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/91072342721.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16086a44931883---zikepejilolimejumoz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3732277a---turajexufow.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/10317b9e990fa75f20a2a012a8b20355/fuvatufunobikudawix.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0194f2602---xebivular.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/42944045351.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f83af54a43dfaec1b19d71ffeda03562/liwoxipaku.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0737e2dde8---tivikotufu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd6394ac9---kulati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=do+warrior+cat+herbs+work+on+humansPDF 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_off0001ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE6D 10868 bytes
SHA-256: ae0fe7c084ee4a5752f0675498f61e3362b48ad1bc9bff9e66d0f65d0330644b
font_01_sfnt_off00020770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20770 17524 bytes
SHA-256: c4bceaa14092e1c18c0433c4e8edaaa7d6364d1d5f31d8e01f5b713b319f9191
font_02_sfnt_off0002353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1