Malicious PDF — malware analysis report

Static analysis result for SHA-256 df911c43e6cda2dd…

MALICIOUS

PDF

91.6 KB Created: 2021-08-08 11:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b7ad50aca3e5e6fa2e60204f12d1bb9 SHA-1: e3d9500035ad93761f8153f3b7f0342b13748dd7 SHA-256: df911c43e6cda2dddf7286fc6845120d92433d32f910e9b1ef3227376fe305f7
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f17fafa1f0aa395256d3fe855a1c0eb9/zojakijiwewi.pdf In PDF document text
    • https://kaptenhoki.info/contents//files/49865597115.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/vavejilijulika.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/81492336651.pdfIn PDF document text
    • http://fygl.net/uploads/file/101704129986.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27c23941---kerojunadewaburigobon.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4514ad5580---80060120345.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e531d900f3---gagafirojujuzoz.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e6b4a09461a7d731abc619752ec27d93/2247858608.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160887a32595f3---4433664885.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f9b344da---63668879181.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/tibaxivufikegurogijuve.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/40111324817.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/vikikegepobitalo.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/rizodotavifelipuvoruzav.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kugijaf.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sadujopirovinebevoji.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d546b45ca9---wumawetaraken.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/faxot.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qioviphnc4ihtp9378gvfgruu1/ponifijoxofafuworitejuk.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e35f90ff7---33941434734.pdfIn PDF document text
    • https://cmoretv.com/userfiles/zapurulizarapelewef.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e20e2de1242---kunufapazafis.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0dc69b27---suxewoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sketchup+pro+2020+install+%26+crack+tutorialPDF 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_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 10980 bytes
SHA-256: 080cb822958353c0c4887d301ca6a5efecb55e2f855a5e24c43e94190333c01c
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 17744 bytes
SHA-256: ad493b8c882f7f564b510dc8c1778996f6b5c6844bf9e11d93e3095322676e8b
font_03_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 8048 bytes
SHA-256: cb340092d74f7ef8d93d0f79d2795fe933cc1f48dc1a5178eb93ec444050f352

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