Malicious PDF — malware analysis report

Static analysis result for SHA-256 f429f8a119043e0d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 02:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4b59cb91eb1043ba077b89b3cbd151a SHA-1: 162954ef6683e8d3625bac859e03632918ba3473 SHA-256: f429f8a119043e0dda4fee0bf89fa4f052f660a64a3f32db2158ce78cd617b64
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://dymenahealthcare.com/upload/fckeditor/file/dukofaja.pdf In PDF document text
    • http://wsystem.sk/userfiles/files/sonugepivepukadezaz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7m1pd3jl1g1usm7j2j35bo5kv3/42126932345.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/nawowolafusenolivabemor.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/47851990808.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/53480617289.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/33512623424.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3570344036.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/mazofesolosipabokatijizod.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/85142950888.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210915115958-niperarusewu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614006c1ea579---gagitewuritunekutinomu.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/dofitad.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614261ee6d768---kaxekelagijusewereti.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/78049290754.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903032345_z27uu3.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/dekotakosutakamefag.pdfIn PDF document text
    • https://tch.lu/files/files/fufesonuzovava.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/totasefawedeje.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/lomupaxakuxige.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d507659e6e---28104834776.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/tudixonezonikup.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/jagewukedorerifetijofiwa.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jebulaxumopabarafe.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/kimifot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=weed+firm+replanted+hack+apkPDF link annotation
    • 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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 17884 bytes
SHA-256: e5373645baf9c6d9ef6051dca0e5f7840de03ea6950a8333e2aecfe7d252104a
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 10680 bytes
SHA-256: 3cb3372d7a8fbdb73004009a8d00214d656c756fffcb6751e1966a10438f523f

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