Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9f48ec3621536b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 12:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a425e8550de94804b82d3da842d3b10f SHA-1: 5f36f8c62bac301c8e955694e276564eb334e894 SHA-256: 9b9f48ec3621536b6fbd1e63422de9e28acb91a94461421daad6996955d39d87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ziva-muzika.cz/files/file/64101984557.pdf
    • https://aczv.fr/userfiles/file/juturomekinafexutelijo.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bf535fe1---24774404177.pdf
    • http://gintaras.cz/userfiles/file/jowadupizitizopuwonefe.pdf
    • https://coonvalleycc.com/userfiles/file/mazuxapuwe.pdf
    • http://uchid.com/uploads/file/1115564445.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/sorodorasaloxasexozibu.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147377d8fa2a---wujasusuvanutewaru.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/popumuni.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b2a89602---wuladukemibimavotiponapi.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/998789958.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133134632064---tunuxisexipijakomexozedok.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/taxibumewimusu.pdf
    • http://peterpan1996.it/userfiles/files/26968895346.pdf
    • https://iveducentar.com/uploads/assets/file/58571546520.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/22365107047.pdf
    • http://dtmaso.com/public_html/Imagens/file/19562659766.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-24/20210924101044228308.pdf
    • http://nineslash.com/user_file/file/62703850985.pdf
    • http://turinhotelcompany.com/userfiles/files/44990111981.pdf
    • https://prestinieurope.ch/userfiles/files/xofudifokojiludokola.pdf
    • http://zzzwchem.com/upload/files/loronixerubuzuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=google+frp+bypass+tool
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af2d.bin
d3453cede03d67578d507066dbaaba314485f8d7bd1ed29b0ec591f2ae1650b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 10628 bytes
font_01_sfnt_off0000c784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC784 16792 bytes
font_02_sfnt_off0000df96.bin
c09b1b166123c1eda54fd95a745fdb25954d4c354e034a98735c2961c505f230
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 15612 bytes