Malicious PDF — malware analysis report

Static analysis result for SHA-256 f049ac7ba7bf4118…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 12:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 615044d7e75902ee1ea0edd7d1a5f121 SHA-1: f78bfd65cde129695fca84c56770559c06ef4df4 SHA-256: f049ac7ba7bf4118f7fcca5e887f3db028ddd14045594783200353f94d14cc00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests the document is designed to redirect users to phishing or malware-hosting sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://philabc.ru/uplcv?utm_term=tiktok+adults+version+apk PDF link annotation
    • http://tofuyatogo.com/uploads/files/6130148288.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-16/20210916120313252508.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/wulitonebuvogetifusok.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/ponesetigorawizema.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/29286136473.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd576506b6---57912212788.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/90276106372.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/46289719858.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/serapidoponuzuvidalawo.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/79549168960.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/54178869426.pdfIn PDF document text
    • http://orlickachata.cz/files/files/62311834218.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wikoloporotunob.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/3700521468.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c888aea0---kuzobedipanelivajo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/791vukp12tbgh3tmo0pug9v8qn/betotizegoj.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1d8b2ff5---wevexusotiboseduj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nugetibiko.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/37539215624.pdfIn PDF document text
    • http://wdnederland.nl/file/57829372033.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/wujepejuropogusamowig.pdfIn PDF document text
    • https://actor-conseil.com/files/file/80691920952.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/37820020909.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 10604 bytes
SHA-256: 0ee82a1d5a2b56294c0719f451efd99343ebf3938591c2c7f992deec8b74885d
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 18616 bytes
SHA-256: ca31cfdf50b039b763c7e99a86c70164b2ef61781eab8f8ca093b78fa045e433
font_02_sfnt_off00012642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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