Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b9c292800e622f…

MALICIOUS

PDF

90.2 KB Created: 2021-09-15 11:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6761675e662b3de555927f3dbaab25a7 SHA-1: 7f9e4e0b07c501570f9f0ab30fa160a6cbe78ce9 SHA-256: f0b9c292800e622f33523abb6ec46690f6db7c834b348b8f443a53ef0826d3e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://philabc.ru/uplcv?utm_term=mulan+2020+german+stream PDF link annotation
    • http://georgekoldun.com/var/upload/file/mupeduwawov.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/94222484480.pdfIn PDF document text
    • http://195exim.com/datas/files/lusekajatiloserura.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xivarafafewewazadexaw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/13827105887.pdfIn PDF document text
    • https://profesa.net/userFilesfile/xiviniwomomubovewas.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/6326836367.pdfIn PDF document text
    • http://dejede.com/userfiles/file/poxumor.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613beaee1c9cf---55555587401.pdfIn PDF document text
    • http://roocenter.ru/upload/file/93616190172.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/suzesami.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/viramitevaxim.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nidulalekujokeligi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/safezed.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/206215647.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fa62b8c8---75401877424.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614170c9571e0---jedobebixewirebe.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/31909396126.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/bezituxefosoxajasuxigur.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912042553.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/zelizodo.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/nikonesolosa.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_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10572 bytes
SHA-256: 20494338341842d3b5efceaeee4a66ef725d50075c81ec6c6da4ae62bd96762d
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 18548 bytes
SHA-256: 43e35a75d23b725b3ce2adac44b6416d236d183804bc2384a70bc1dd39d23970
font_02_sfnt_off00014369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1