Malicious PDF — malware analysis report

Static analysis result for SHA-256 c729c2f8bd9eb695…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 16:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 573e1a60df97eebeb70825d4f5e68ac1 SHA-1: 78513325ef295e883b63108aff7d6d76c76a6041 SHA-256: c729c2f8bd9eb695b05d50371222144f54733496278a73b72bcfcb261a18ae2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm on disposable hosting and compromised CMS upload storage further indicates a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=islamic+stories+for+childrens+in+urdu+pdf PDF link annotation
    • http://technoauto.jp/js/upload/files/retezumiketixibar.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/71407103365.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a110ac876db---runaruraxofol.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/51120668879.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7b3mosb2mv94sqb1s8tv87r1e4/35067057866.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/52204411136.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/zosiwubel.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e8628d7c8a1ae0583c993add8c71d953/zimagu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/54620468059.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/35677070899.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210828000957731376pxgpa138shoy.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/vaxal.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/noluvunizunuraxumewatesi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d0f183d8---14644441617.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/62196566211.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d4ca338d5---12065685365.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/29bd87fb51ec647a65a823c21fb175c0/netumixilexinedowebapeb.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/70374097686.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/alveoedfj30jdppcf9i2v5krm8/kuretamipokukasudesan.pdfIn PDF document text
    • http://detmers-kontejner.hr/files/48192186461.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/javimagabukozoveza.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e93821be8f4251d933b0c8d00279e767/supuluzesi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa0040e31---98382578708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd0db9543---53443442877.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_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 10936 bytes
SHA-256: 24744dc472d8efa718d8fd0b35f4af74104e3010b4921f6ed87fdb946f123ed9
font_01_sfnt_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 17656 bytes
SHA-256: b881653e4173e78d593822c0dfc93b4be9253105ba1eaeb4fc8c0907d44cd703