Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfc01002a395fb9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 19:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80ca36269bc29b55d9eab756f73df0ef SHA-1: 35908e42c72acb83dc4f800b42f90116fadb7dab SHA-256: 4cfc01002a395fb9c48d089e08b777c28b0fc86a855097b6eaf110700974593c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://klpa.net/userData/board/file/bufimibegajetir.pdf In PDF document text
    • http://stauarchitetti.eu/userfiles/files/10573219074.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/setugaduzuwulofuxonan.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/42309556756.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821030a5bf7---26720281728.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1d07b5e6cae9338f8b69f88c40804625/71999679088.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7b04b4a8e1586ef8c9bcfd26f846df2c/zipire.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dee651d69---67691768045.pdfIn PDF document text
    • https://eventspicer.com/ckfinder/userfiles/files/moluli.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/49740642712.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210820_7F9C9CCDCDABFB77.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/2548465548.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ba7e5b33---56014000320.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xumetoxuwijumaxu.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/56532103180.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/39795056699.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/23225639330.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/bijezesobuvagegineme.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2c97b14b---71020119950.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/25651991239.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/wowudonuvogi.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/bevopogumoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=volume+of+frustum+of+a+cone+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/bubozut.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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 19016 bytes
SHA-256: 5196de18e9490752f8f9a8cff1e8150f891780f0a2d765d3c5673232da1dfe0d
font_01_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 10756 bytes
SHA-256: bf8e2f764822d6be18fcef72cb8039721126d3443e2b4f605a87e7ade4dbf492

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