Malicious PDF — malware analysis report

Static analysis result for SHA-256 71399fcfabad0b98…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 00:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47bad297d7aa2a9835a983dcb82a9723 SHA-1: 0240e38df2091a8f6351506750b594189c721408 SHA-256: 71399fcfabad0b98cd11e769fe15aec553ef2256c7837ba1dcf68932ba17cc86
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ketchas.ru/uplcv?utm_term=easy+2016+watch+online PDF link annotation
    • http://fotosvatba.net/userfiles/file/80012599269.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210910_193854.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/zurunodotufakovamowewexix.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/13405ac9f01ee8f4d25f77668b725a15/66760601733.pdfIn PDF document text
    • https://photofetimages.com/57383716466.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/98900274568.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/86285048601.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9d72c53d---43291889827.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/76122399703.pdfIn PDF document text
    • https://anjingliar.com/contents/files/6918422281.pdfIn PDF document text
    • http://artdental.hu/editor_up/wogifopavadutikujujigog.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/nekiralulesagi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/954798f5296f625944fba0d73fbb7bdd/konimovomegimasi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/ladoxeje.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/sevuroxev.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/72003653478.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/15167631799.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161335de8588b9---nufagadogipapidaxefafurok.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vaked.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vrkfjo233a7uko5obffs31cbb4/limokikapaxepoxemefe.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/26715854453.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/30852294773.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_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 17512 bytes
SHA-256: a5aab9ddc48bfc4f1dc87e944e11479bd90b961d71c72435c0bb46473bcb0edf
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10872 bytes
SHA-256: f46911a2f539c98a00dee363f3c00547f66b8c0d360e39d17d8354d7f5907f60

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