Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bbab4f2a47749f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 19:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e76ba2e6c66b20d7e2eb9a8b482c7be SHA-1: b0abf21eb18176b4d81a28d2bfb386552c5d664c SHA-256: e3bbab4f2a47749f6c388b82f804df3d002ee21a2f717a03fc0afce3cb92d8c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a compromised CMS upload functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=how+to+open+iso+file+in+android PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c0d1c809---nudulawifuripijefiwupi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0ff3d82f---xozim.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/56018711614.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161304cc2e0f12---pukiwexopiw.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/71685554959.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/69476543037.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/sotidiso.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vukamodamunadupafil.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b31c7e4cd---savamiri.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gobonof.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/misivelew.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kikuxelomalawobelomup.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476134ea51e---zunoxaviramuwuzusojagiku.pdfIn PDF document text
    • http://rapet.hu/files/63603203422.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/31317527086.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614807df8fe38---xerujexer.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2s771qkii3s957mc079dh0ato4/88850456089.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c21b823e1---vowadugasek.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/nafunuminusosifuriseguni.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/16048175495.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e3d56978d488ed02507466daeea68013/budaxikewerewix.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/8249877181.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/webadivararas.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-20/images/files/mezoxevara.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/68514706911.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/47127916520.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_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 17924 bytes
SHA-256: d1a20ddc94efd5e86e187bdebccb7e327eb8e183ec6b5d5e94de0c5899ed7cde
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 10568 bytes
SHA-256: 3c25beafcc0aad8132897bf2fd0d1c3180cb43f35a2714cb8c75033315962cc8

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