Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a48bb62e9ce0e99…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 22:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ac16634ce737a36b72504dc8876531d SHA-1: 9d6b655649e67dfda5bbbc0c8c582972ce2fc8a0 SHA-256: 0a48bb62e9ce0e9957665f84a9d8a60660d2f1e7e8f1d43499a21c1da0468ebc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these linked resources. No scripts were extracted, but the structure and heuristic firings point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://caffepontoni.com/uploads/file/dapusomezawexalifubilof.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bgemj44moifp0k885g9ausmco7/zowojimadavujeruku.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2ca3f61626e25116fc828c8739990e41/silovarokagirisaxi.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d3fb0ca3a472d7daf6fb9d1f22aa6472/zuluxosozulasigijan.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/70a6d36d7e1f2227182ca16148554b86/fogizotovovewojevube.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6du2kknhq73bfi25hjvvffpmsh/tuzixavoket.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/h0omu3k158rr9qorrmlr69irim/31705698059.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/87682630921.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/37637362540.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/66296520948.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/53210296706.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf7db80ca---47977328454.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021082617584173499.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8362e0eab---27796001882.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/nezipunibuliviwonifat.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dulexafu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/581c6776279b604284b84ad2040a423d/lojijelifagef.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/80081763996.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/vuter.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/29449697436.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/27c306d764214ab396f6f85b6c4b9c5c/kinalemuk.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/c8avjrq7idgc3jl1aagvodtg64/lugegizavedokabimapiniki.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4eif2on9u2mtu3j6n08ljm1fsp/sukolojuzefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=particle+physics+course+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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 18444 bytes
SHA-256: a2ceb03fbb094dfe22cd59919dbf828834d1b3b4821109043539179c3f829c71
font_01_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 10828 bytes
SHA-256: 789cba3d05ce7fe8e78cbb8c9dcb117d512588ccc4c39bf8353abf9072b06bc6

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