Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791a6af0d304549…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 11:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9836ead17e31cfdf1a0d778180fa3b1 SHA-1: 8e2aa1a946ff6bd3bd20b8f2aa754fb9f2927ec9 SHA-256: 4791a6af0d304549d9711c78f7492b68b51c007180d10435d1dc5118791477c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed as a link farm to distribute malware or redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2979d47f---sekadexopibiluxabi.pdf In PDF document text
    • http://snft.ro/media/file/banisobewafixufuza.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/26783197145.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/47804920109.pdfIn PDF document text
    • https://ikansambel.com/contents/files/kopamolu.pdfIn PDF document text
    • http://santehnika34.ru/images/file/wuwepoma.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/63870212834.pdfIn PDF document text
    • http://hasyo.net/files/file/rudazuregegid.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/lizezox.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/69725850989.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vujanikuxudofaluz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ivvqjvqks5b3eefpoqdbg9oiq4/2573313649.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pejuj.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/zibimipejawemaw.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/farefedipodadimi.pdfIn PDF document text
    • https://zhansq.cn/upload/file/lekusuxiwur.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/93865986692.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wunodubusenifegi.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/pafolitar.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea496e8807---30970906059.pdfIn PDF document text
    • http://opersan.com/file/1444261508.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/76e6f09627cc73984fe5f1bebd9888a5/32730997368.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/81742274782.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/dusifu.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kosobaladaladi.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/25058163780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bella+luna+treehousePDF 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_off0000bbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 16472 bytes
SHA-256: b5558bd61594c901375386787f026a56fc4bc09a3683a21fd40677e55b3c080f
font_02_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10264 bytes
SHA-256: 7da018504c20ac408977ab368d3d1f98ce61853a9b650b74d31b27e143a3ca81

Open this report in the interactive analyzer, or submit your own file for analysis.