Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd984cfb150a85e…

MALICIOUS

PDF

96.7 KB Created: 2021-09-02 05:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 065b84703c3ca2c11acb3a3fa3b45452 SHA-1: c7739db17af9375f79952ea9d91b504a937c4864 SHA-256: 3fd984cfb150a85e02ace007f55eb46a7402bd1f3152aa3e4f9af59c5272197d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to multiple URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user interaction goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekubonuz.pdf In PDF document text
    • https://watertorens.nl/userfiles/file/gubinesopokosowo.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/pofurupigamu.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/lalavu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc4968530---jujeruxiruwuze.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/b4e49931c7f69ad3c73b8954dd8d722d/tibapukelowile.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/bizoxesezabazine.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/11812497303.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/457a48b2e6699b7d2d388e2a3dc5388e/jojizokuvigejegawomin.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/072ff66e0084fccc761425aba65f7522/26719805258.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/nodulimulazozogeki.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/95229268761.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bfde70445---saviku.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/afbf1d5e9cf8009900efd52ec7c735de/xaxire.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lazimubigakov.pdfIn PDF document text
    • https://virker-ikke.dk/files/93842815614.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/ropikufoku.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/81177442411.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db193410da---wekunigubivekamesowuk.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a7b344435---41378606125.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0bc330253b506c728e2bb9b06ed2e393/50914877603.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxuduvuweturomanupetonob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+a+209+area+codePDF 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_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10720 bytes
SHA-256: 8ff9cdb6ccfd0744e654b17b6664b2f02287b9dcc2680e4c81fb22b82cb8410d
font_01_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 17932 bytes
SHA-256: 358e4f41af95ee15a4df27c0e98a3a0c9e21020d134fe316fe1452ce5ee968af
font_02_sfnt_off00015c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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