Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a19272b7009964…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ba149350dc124ebcd915514c4459a5c SHA-1: b9ac1fb501a3c5bb7a060c650276a0a90f0c679e SHA-256: 58a19272b7009964efc94353429b110730ad9ba5f1c30dd9143737386314f641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest an intent to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.elshandmadedesign.nl/ckfinder/userfiles/files/76176948451.pdf In PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/tifanavefefunuselub.pdfIn PDF document text
    • https://webaprint.be/img/file/bizusatixexodirisadubube.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/digitewox.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/83432508799.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/73855511562.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gabudepugupusude.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/9986626367.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/tororiwijokidepavi.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/25083375026.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77567787d---jozopefitogelizerisaji.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/79694473923.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/jufubikerigedowejotugo.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/kefagarug.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/86326843155.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8e211f62---badeximemasuxebodufa.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vinazodulitetowipoju.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/63659901396.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/92096804740.pdfIn PDF document text
    • http://cudicio.it/images/file/susorinujoxelu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xujibel.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/gqrnc1f413514m7eq5uvusrf0f/gopavijasu.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64044138600.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bipixatenimadozavedeb.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613958b089ae5---tawonobopukafifafun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=app+usage+history+androidPDF 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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 18056 bytes
SHA-256: 9b7285c8a8af0f9048170a4bdb4e785e7a1df01dab90058c06fce6bd4779d811
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10820 bytes
SHA-256: 64547ad11fef7605f0d9d42aa7c223cb9baab369458e40b31824074f112e7e99

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