Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2e3c2e3970ee9c…

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 16:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f56116391b313eb0d79643a0e5d7942d SHA-1: 3c424281828bb27c75015c2ccb7591b7ccec7511 SHA-256: bd2e3c2e3970ee9ce2ed6f600d55de4574ac7ab8c478bd5651aa90aaab44e2a5
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=health+benefits+of+soya+beans PDF link annotation
    • https://electrabicycles.pl/app/webroot/uploads/file/16233459253941.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pizasobiduroloxotes.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/maludarotufirezikakuwixi.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/18018405453.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8901cdce1---netisetatutarab.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/35584632682.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0b5ed5a1---39582002594.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/59122306129.pdfIn PDF document text
    • https://computerzone.pk/file/27800360120.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/68081229900.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/81709520447.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0a3792492---tulozuriwugi.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/85385689872.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/golis.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/77642954168.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4143a697b1---27542722381.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f8b56565---88333523920.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086d87152dc6---ruxafixuxevufon.pdfIn PDF document text
    • http://ahchala.com/img/file/20227222498.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9463j3sofc1rvc8jl41l0uglb0/foxadeso.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/pifewejuseragun.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/62967237370.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/gidibukuvetovubakivoka.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/91dcc585cc7c6e3f5029a9f49c9da9ae/11110735401.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/edt2mbduhejgr2b5s474772nd0/82645100100.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/24004649323.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/dujesuratuvekesupege.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d89b557c10a---98361793779.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_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 10456 bytes
SHA-256: 4523447ba2bba09b91d97f055175881da8d3a1787a0906c6e3a78bd38fd5d8f5
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 18412 bytes
SHA-256: 77a933df7473b0bb05dcb0c7bf141280e83e026210b99b0d2b3c014b5628d925

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