Malicious PDF — malware analysis report

Static analysis result for SHA-256 1591efdceb4aeff2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 04:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09255f304af36d7281e76a62a12db913 SHA-1: 3ae68ce7a27ac8421a3e1c9bed6f960193dc01b3 SHA-256: 1591efdceb4aeff2be022e5beaaa8e49781d12be9c3be56dbe333a5115ce2577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://childconcern.in/trila/userfiles/file/paremadupidojinubi.pdf In PDF document text
    • http://mofrantech.com/userfiles/file/milisune.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/tupojex.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/205b6ef2b111ba82a4c1bd9a59273cfb/pufamugeturiwonex.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16106d83631789---59408247777.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ac5087bf---fukenodamurotigepilul.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/36626129218.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/vm2igf9jnad3ulvuf6r9j8rnk0/92064781389.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/9943581027.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ffd823b385d6e806358608eed489c830/xezovewadotafolutejuzan.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/roditofilaj.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/2123400980.pdfIn PDF document text
    • https://artenika.pl/fck/file/dadabiwujoj.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/fitogarage.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0v80av20pkfh9tcuf61mad2k04/55709516946.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/27706615075.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e566bed4---rukuniputetufofunej.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/lugasamusajazosopu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4d3c75d5118c5f9e2f8c980adae8122b/garadoguzuletevujetir.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/99023069813.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vafej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dremel+moto+tool+395+manualPDF 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_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 10584 bytes
SHA-256: 2ed441260012a12d23b1a884d9f68c7286a9677d21b0eb560661ecb32f3aec0f
font_01_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 18784 bytes
SHA-256: d8347747a4cb8c9ecb5b969bcab74c583d6aca190d9a64ede8665aeeb03c02c3
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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