Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca7f6c05e25921b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb4fa51f2ad70e3374760cdeafafccd1 SHA-1: d8f6c5b35d30a6c95be5df6148273a7edec8f49e SHA-256: fca7f6c05e25921bf2f28aaaa96040b15f1ab4ed8a99f6a36ea5cbb9661c443b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mamtaniketan.com/userfiles/file/40441708804.pdf In PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/34912500695.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/dadumupumuv.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/18950565648.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210904180549196192921doex7rrhv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143618c30032---wibaniviwipulosarimafiru.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/tozijetorobo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/haqkaoem4t178icjq2rbba007q/90952240897.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zemumisutukubogerozekebe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136fedc05044---lisalovirivoviw.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/vimuwuxinexigasotajowu.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/37528702957.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/nugadubu.pdfIn PDF document text
    • http://szm.hu/userfiles/file/46491324295.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613536aa56767---tikazovigokoro.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/91437541579.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/30272557186.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/92371177913.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/32309226997.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/50696823547.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/23150340138.pdfIn PDF document text
    • http://pmke.cz/pictures/files/36906452690.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/sedaluzog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=game+launcher+android+11PDF 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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 18312 bytes
SHA-256: 2b74cdb4203f2b8e601949b1064c0f176731cc98c3730622de8a9fa5cf232903
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 10560 bytes
SHA-256: be3bdc911949b8220396d346a5df8565497fca96febd5b8d06691fa3b0702e91