Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9a1342daf7c1eb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 06:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48f3daed39a14a462de7afbaabedb279 SHA-1: 61a4d9f03da1c061a62a2a16daf93d21c46f10a0 SHA-256: 9b9a1342daf7c1ebc677fe8667d6b73aae5be5c561e1388b77104db66331fff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=clean+master+ultra PDF link annotation
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/40818988288.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/12959216507.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/vunimemafobabagejunebek.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341080e1265---kosoro.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/bokarezuwudekodetatibe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/19vbt4fc248v2n5eq535rkfv13/nagajonujikirenu.pdfIn PDF document text
    • http://kmsenior.org/file/files/40049836943.pdfIn PDF document text
    • https://akconta.com/uploads/files/27017847660.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/sidasubivotexabowe.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fadazipivuwoboxasul.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50441210844.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146bd92aafc1---rupenufokijinid.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/52966876335.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/38319551874.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/woleg.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kevitiwiw.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/17847694119.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/kegobelezarikujerisunared.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/motidubuxenigam.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/larivajewosibovatutopi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e61b8e66---pozotefumafufujowitowiv.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/3003252094.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/19382739403.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 19004 bytes
SHA-256: 001843d6c254d6ace90c8b8289c535b5341d33203d8d13e8e7cc39c451c222c0
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10188 bytes
SHA-256: 2d7b8cfed964666b393be65b07d8c95f4376d1c8df01cd0a84ba2b3265627f12
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1