Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df9fb79a4222ef4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 23:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f720d136ca427ae2d1e6778de3e47a5 SHA-1: 43808c6352d91ec4ff0ceff6bfe64e4a6db472cc SHA-256: 5df9fb79a4222ef4c5ce3ba79bc38d0ea0b88f3a20a9506f46ab58408e5169e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=where+is+network+data+analytics+android PDF link annotation
    • http://grandfiltr.com/files/file/53498960574.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/deforelovumoriwinulanupet.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/99897071165.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/ziduguvoletorofunuresapi.pdfIn PDF document text
    • http://kyea.org/imageuploads/68938976906.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/xivigujedowozo.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/32380535351.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2c1230569b8f59061b4c9ceab5332e0f/32164336627.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83093486625.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/jewadenareb.pdfIn PDF document text
    • http://airsoft1.ro/files/file/nolomagov.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163248641993.pdfIn PDF document text
    • https://megashina24.ru/files/files/85923330041.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d8d124b35a07a9394e0f5e2ca8d2ac13/giniru.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/sazedasofoxuzivikabusiga.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca08536e5a---xojiwedusar.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/divugokenoduvobore.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/tovepaxosabujame.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/17009577164.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/645bce2e6207ae424286fcf5affe4189/26016756485.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nokonigona.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/7237731946.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/70569248867.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905131242070220ek09a7.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/visulapimagufotiba.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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 18320 bytes
SHA-256: 0bbeac49db84eccc99c5ae63166176bf1426158b69f69cd7f07614399331b279
font_02_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10752 bytes
SHA-256: df571150380d97cdbf639d936d677688dac27882850637dc477435e3a4c1ea20

Open this report in the interactive analyzer, or submit your own file for analysis.