Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8ed4c387881fbf…

MALICIOUS

PDF

63.7 KB Created: 2021-09-01 16:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9be83c4fc6fc9aadecbc5c91e3a285fc SHA-1: 0cb693bbb625518e4a1719d10597d6285279f097 SHA-256: 3e8ed4c387881fbf548220669f6ea4939f1607e08e1c153d38a84783c775e53c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites and algorithmically generated URLs, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6390

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a524de62---verepumujojos.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/76695555669.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/88386708164.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/6437971166.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/35278062715.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/22859319614.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/fisanibaromixinanudaje.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52dfc25a18---rerefavufarelo.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/ligipazagimolagolase.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/89830533032.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bibidibugosuxorifupez.pdfIn PDF document text
    • http://fitviewer.info/files/file/jomulefowijapozuv.pdfIn PDF document text
    • http://dfanchem.com/upload/files/81249044732.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xefitofavixurazobiz.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/90113287893.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104659cc38c0---tavezatalusodaridu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6092822c9---36890989338.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c718c12a3771864efa396cf7025783f4/92671963462.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kububepeken.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b372feec44---2760487247.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/77527385972.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/demij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mixed+evergreen+forestPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10480 bytes
SHA-256: dec5ddd1363f56cd9e29266d636ad13b46f9d37edc583b68365eb1a8cc767062
font_01_sfnt_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1