Malicious PDF — malware analysis report

Static analysis result for SHA-256 184317763f4bb4f9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 04:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a17917bf7f159a5e8a9e2eb100d0da35 SHA-1: 7b35a48204960a4bcdf746b72c94e671e434a91f SHA-256: 184317763f4bb4f99669cd91d42c6bcb8cd658f3817ec359ee12ec8e092f5e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://lacasedescaraibes.fr/file/fululivedejizozejalakuzaw.pdf In PDF document text
    • https://legend-chang.com/UserFiles/files/modudumikudulaxada.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/71382722504.pdfIn PDF document text
    • http://stefani.cz/fck/file/xadokuzabidemagonoj.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/dejikuvater.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f98df5b2---nirediju.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f247be80be---75818257187.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/mokujoludamogonu.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/voturol.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/85328323529.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/paxunikut.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/kimesirizifofuzawime.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/77902308043.pdfIn PDF document text
    • http://berbun.com/user_img/file/1657636793.pdfIn PDF document text
    • http://dsraxys.com/uploads/botevanefewebomimaxud.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/44693686960.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/86671173850.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/38211200959.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/ragamixivepeziwutexu.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/25836489282.pdfIn PDF document text
    • https://festacontinua.it/public/file/68074557594.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/68242040396.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613918c76654e---16997731134.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/97485481972.pdfIn PDF document text
    • https://akconta.com/uploads/files/taweve.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/92378435315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+auto+settings+android+10PDF 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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 10632 bytes
SHA-256: dbc7a4d3c287b04ac14ea33de8f9c0ce14d30ed95aa2669f5fd45cb5e3003445
font_01_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 17292 bytes
SHA-256: 549b66c68b335a6c599dbec923818691110454164fda55cc2efe17c64267b20a

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