Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab8f5d1c6ec15d1…

MALICIOUS

PDF

88.7 KB Created: 2021-09-14 16:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 995d52489fa0a2029e96689e38e85e54 SHA-1: 23b4df2a67bf0044c745c1d1e37499f22d12a7b5 SHA-256: 1ab8f5d1c6ec15d143498e70cbf259d6bb52f7e0d4e580e4387639a183976454
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdf In PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908030427.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ae8ea76b5f782906ee436fb972f05e1e/gowigifixakunexif.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5b563a56684ebf6b3651a5d23102c23b/favekakewuwefekojelupe.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/nodozigomodura.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/66620046356.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/wamunununapogerejiwujas.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2a1ed01e---42989507034.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/lowenagisoxopatikidewotam.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/80142763688.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/17438310584.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/liwutajito.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/65456820189.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/24447682783.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/kuragodatirifuzed.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/40507667061.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/xopexilakil.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/pewujagigiwasamogene.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/wabolazovudaf.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613c749f4de30---63202382145.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/60073807614.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutemulokufulodezixo.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/wowizuzunibusosojirezekot.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/58444728380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+fire+hack+link+unlimited+diamondPDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10744 bytes
SHA-256: 51b1057ab60433bce29edc4eaca67a9faf88dd94d21afbc9f6e2bb0c76c213d2
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 17980 bytes
SHA-256: 25a6bc22523af6df19e758a0240679c0f641599b869d1291d2080532bc3b6670

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