Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cbb67fdc599034…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 721cae759114013ea51093fee4c7402f SHA-1: 786b0b2e5e212ea4a0a35582e2ce4f3748e8e8e1 SHA-256: c9cbb67fdc599034fd73e511343dfb6d37fc482ce79e9a7d8b57831ac0d5799e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links to potentially compromised domains and the explicit instruction to disable security software strongly indicate a phishing or malware distribution attempt. While no scripts were directly extracted, the link farm and security bypass instruction suggest the document is designed to lure the user into a malicious site or prompt them to lower their defenses for a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 https://mytalk7.com/_UploadFile/Images/file/sozisuz.pdf In PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/sakunelasonototukuvajikeg.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe9ac9acb---fenusimejuzadumefem.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142578af3181---dadijaresavi.pdfIn PDF document text
    • http://st03.it/userfiles/files/dunevuvivuvuzag.pdfIn PDF document text
    • http://dasbluemchen.com/52428170762.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/fezegamomojulugasore.pdfIn PDF document text
    • http://aa-nusd.jp/vuseg.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gatidudape.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/3265608646.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614442ceb1557---45054597622.pdfIn PDF document text
    • https://gdaniec.com/upload/files/21956474549.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lugopileremunufevuvidis.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/92724970512.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lamutinifikede.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/webunajabalenuxididuz.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/40380470592.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/lifedafabavijamed.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/21867506139.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/taromuvasakirazez.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/34670984657.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/88754839563.pdfIn PDF document text
    • https://alutat.com/data/file/20980631272.pdfIn PDF document text
    • http://chengzechem.com/upload/files/29066623120.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210916015755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sign+into+wifi+network+androidPDF 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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 18444 bytes
SHA-256: 72c80a5932812efbdf8b3c0cf886be4b9dcabc69935695bb0487504c03e24f81
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 10568 bytes
SHA-256: 286aed58632cce8d970ec5b3514d3994a71d9236727f180dbc7ebe6db07ac8e9

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