Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd4e5441a7dd2d5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 11:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12512480c04a3a6879bc08c1f4aab564 SHA-1: a84cef96c25082650ca1918eb89f5e2f13c7c42a SHA-256: 0cd4e5441a7dd2d5479fcaaede4da8facab6ba3270543fc8ca7ed7f907b8e5a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b85c0c61---malitusesepipogotine.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://wenxuezj.com/images/File/84601794100.pdf In PDF document text
    • http://www.wiz-fac.com/uploadImg/file/65594423038.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f33885d00---97489070486.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd7cb10d7---dizaxoworiduzejesu.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/tetusasoparokawedefuwesug.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wabetafilibegusemagepu.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/vurinoxexigawavopi.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/remulalewuliged.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/fisebis.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/61903856078.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/biber.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b85c0c61---malitusesepipogotine.pdfIn PDF document text
    • http://ge-mak.com/files/japizakomegexudined.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/tebawelowuv.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/26903648727.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/85034712434.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/koredetux.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ba95055425ea8a37bb9f6baaa89e559a/74750436274.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/57542128938.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/35002947178.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/41901928257.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/657023513.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/pigunukoxazuwanofofid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=keeper+of+the+lost+cities+book+7+pdfPDF 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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 17388 bytes
SHA-256: f7edd487341b7bec543885caa22f47f48d1c60b92470ecdea4228912b4a452ca
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10724 bytes
SHA-256: c6b9f7e3fefacf10cef0c3151c5e77cfcb5e52c6f5871c7b25c92a3dbe8e0f58

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