Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e4d4974ec3a3ff…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 16:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02476db49858b0b559d1505a18f7799c SHA-1: 269cad3bf97b84bc1a15383b6d1de4e158f6be15 SHA-256: 81e4d4974ec3a3ffdff76b9bc0957e5776ee92641e66cb45aaa9a2825a077644
184 Risk Score

Malware Insights

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

This PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kltccompany.com/ckfinder/userfiles/files/dubujezutegisubobalevexo.pdf In PDF document text
    • https://rrr71.ru/upload_picture/wenufever.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/bokuvirobaku.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/latazoxudirirewaxinu.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/81819673600.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4q6ltgcqe5ff9rlaef8putleil/58541545765.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/drteomdrvo0jd8vtfno3a20kgg/zagiwutujuxib.pdfIn PDF document text
    • http://anpo.vn/upload/files/timeroleguguraxizade.pdfIn PDF document text
    • http://foodchemsino.com/d/files/kunefilajapel.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b044eff5e---wubipalixinubudes.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aaeb2e77---fevevav.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607028f9b1ca6---90217876058.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wiwupagiz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87210513830.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/kufuninikukuminolizak.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/5679911233.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e75901b2a---dejukufagezopumo.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/rojomevimokirekoj.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161206dad2a2d6---77911431284.pdfPDF link annotation
    • https://coluer.ir/documents/file/fatimerugetuzusawel.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40e6f68615---57870870584.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/mof27mp9ibvgkeoatjart8vhr6/xoviponezag.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/22551208553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+morning+routine+book+pdf+freePDF 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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10904 bytes
SHA-256: 4d04b13704bdcceaf249c0f7420509b0258f4f2f6a3ef7543b7f4afa54e29235
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 17752 bytes
SHA-256: 1271565f1195d04e6562e5f7dbe63a9dc0903f548e57446ab5405e9dce8eec75

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