Malicious PDF — malware analysis report

Static analysis result for SHA-256 8370f6ea932243db…

MALICIOUS

PDF

73.9 KB Created: 2021-08-31 14:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83d183d91a91bba0aa0b150bda0f1d45 SHA-1: 99524fe4b318927d3ec4d3ef8fa1d6ecc32dfe6c SHA-256: 8370f6ea932243dbfeb213a2f778f625d2e1b434426d41992926a8001a007c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of ML_NYX_PDF_MALICIOUS and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=faisal+model+test+papers+english+class+10th+pdf PDF link annotation
    • http://gartenstadt-apotheke.com/userfiles/file/befet.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e05f9a770---92983042080.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/59647988020.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/73309400580.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/72986661354.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8af842bedcd898d457c6f60c087dde11/ripowetaxaruxibaponu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf5f22a2bb726b3a17c9d1212e7f6bdd/65782597084.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/vawixejexutozesowu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074015a99b4c---79713906593.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f0d1ee1dbf3304ed3c5dd5b444764190/wafelebewenatimabeki.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/nujuzotiserekelipol.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/zapetebogugajakagod.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3vn8u2oqf63e0cps3h680oui2p/tipozadoneditewazemunoded.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/60108004088.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/gowavoxigaxitixoz.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/241105466999.pdfIn PDF document text
    • http://pasaru.com/upload/files/52586493274.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/31184679467.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/41988523683.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mutur.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f0c9c298961923843f80b911edc335f/nuxumo.pdfIn PDF document text
    • http://edgecs.net/documents/rubulon.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/krpcf4kfbrn43njr672bhpmv87/vemitagafokup.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/38255307950.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_off0000ba02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA02 16612 bytes
SHA-256: fd5657da4187d5152d51bda5a08dd1aee0b1d9606ac96a2fb132f40c75ce2536
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 11216 bytes
SHA-256: fa894b793afc3999d0f009c69a3653ab9c034cfc0c141e305c5648ff46a968ab