Malicious PDF — malware analysis report

Static analysis result for SHA-256 867c3756336f75d4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 06:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d0e20e2ed16ab87f9b2b1119626ae4d SHA-1: e4dc36a9be502e5f661ee82adab8150930a632c4 SHA-256: 867c3756336f75d44416146c1d226614c91c7d381d34bc26cafae23ab28d4430
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous potentially compromised websites, including those hosted on WordPress upload storage. The primary goal appears to be luring victims to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=japanese+movie+in+the+realm+of PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6e6d13e0f---90172781144.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/97174969275.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/13175542216.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f71749b730f---kawalabit.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a9dfcaef587bc2716deed52228de4e65/lodos.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088683777ae2---52479415071.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gobukosazafemi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fb400b95---61416559573.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f0rahdk3dlg0l0hjj2q1fl2o93/6525712449.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/fajagokigokasawadexa.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/77637139439.pdfIn PDF document text
    • https://asi-filter.pl/files/file/6235598065.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1339909bec---30124213858.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160783bcc8b2f0---boxuraki.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/41135548924.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/didojipa.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/1399934325.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nanobufenobebu.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/26589659712.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/27835081315.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xapilekujabudazeranom.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/zibekabivel.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d31304f1b923ded81f4e74b04f3f9a42/38735903932.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210626120858.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_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 18336 bytes
SHA-256: 1f5070c20d6cf132f5db06d782e0a48f4bd61a3cad2fcfe90ba1ce8f21c466bd
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 10680 bytes
SHA-256: 4aa4a8f82b26307d1726c673334fa6cda463a4e46fa994de98cda85eb0e08576