Malicious PDF — malware analysis report

Static analysis result for SHA-256 0075baebad37153d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 22:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25cfaf3e868f8e25f7fb50527a358dea SHA-1: c8bd492a35206b503cee954f5b551af18c68f38a SHA-256: 0075baebad37153d7a47e9955a1749d929068aaa735c52df6be5ca48d6d7397c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. This suggests the PDF's primary function is to redirect users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://reutlinger.pl/userfiles/file/46941786605.pdf In PDF document text
    • http://alptw.com/images/files/tudomumubapefuvegarizow.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d9f18d50---18819450913.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/birenapifegopugejup.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/36728718268.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/msa52m3oj6uk3k7c6tfg6h3oqm/89422028323.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/44147572839.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/32902474924.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75517742015.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/bagutatiralibovoxej.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/dudititipal.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c369e6fcb1d2441bd19eb60f344dc003/wakabafofav.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/midali.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd92687ec---63686803421.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/nuzadikolemegilim.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/56550946510.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/sebelivazet.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zozukakajejewenewevo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fakimibabosomatixalabeb.pdfIn PDF document text
    • http://18554080.com/userfiles/file/mamakumiguwewasipuwu.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/20895461725.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/63416512611.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/8306739833.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/19928243475.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0cd99050---75725879527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+laws+of+thinking+pdfPDF 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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10820 bytes
SHA-256: 88a08528a196119850797a697a4853701af0cd5ebdc4c57bf062c290994503cc
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 17112 bytes
SHA-256: fea3fccdce7c199281bc11e3dc844d149327d6866bc2e010d2591a5d6d34e79f
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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