Malicious PDF — malware analysis report

Static analysis result for SHA-256 f293030464c610fa…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 19:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd42b93e5364c0bd7c7706c146008a2d SHA-1: 5f94c99de6b46d711d1a1b54a52d60edeea37c1b SHA-256: f293030464c610fa65afb8839b6d2c642b306a5daff8153df62fcd67d943532d
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to external resources. Several heuristics indicate that these links are part of a link farm hosted on compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content or further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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.
  • 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://rbc-bezorgdiensten.nl/upload/nanaku.pdf In PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/67081696858.pdfIn PDF document text
    • https://techlan.pl/files/file/30530499449.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/jegalurixebexonegajosolow.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/jadav.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/pumivuzitokixinezox.pdfIn PDF document text
    • http://rjt1.org/upload/files/60752515414.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a565e01bd5---sufomozateboda.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wilulemup.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/wunoxobokesurawomolidunes.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/41669586485.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6es246dl5grg8pctcd45cu48un/votametugaladegepaji.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/92579747279.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/faxapebatuwakiwotuno.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/28006461225.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd757968c980a7289a5176089e414eb/20457137783.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/25920611802.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/texesalitotovevor.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/dutububabupugubez.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/26d590e7669859c2462d041883b85fb2/80065609735.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/46887387884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+online+image+to+pdfPDF 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_off0000ba25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 16860 bytes
SHA-256: 79767fcf2836d0a8f3284e7389ba4bc9b191c303897cf4566beb48505fd3c780
font_01_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 10768 bytes
SHA-256: c37fc834c36c5c52f641b7563106af88ef7629eaf7212c9881f88ad84597ece9
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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