Malicious PDF — malware analysis report

Static analysis result for SHA-256 c071b5f54c7cf35f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 21:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cd21ff4c6ea4fbe1109f9f59921fd4e SHA-1: 7488df2a509c792fd167c2c55495054406641cb2 SHA-256: c071b5f54c7cf35f09c0e1a42a59a3ef9523be5bc3f0b44c8cf0f1e349b74c73
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dopuskvsro.ru/UserFiles/89525547314.pdf
    • https://1tlstar.com/storage/uploads/files/bedogopaserepalu.pdf
    • http://romangruszecki.com/uploaded/file/48942285579.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/dejazake.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7139b7d1---xezerejusinojalewox.pdf
    • https://mavibusiness.it/file/tufaxamexifevo.pdf
    • http://chinawin-consult.com/userfiles/69211834471.pdf
    • http://bukhatirhomes.com/userfiles/file/zoxelonuvekuvelas.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327d172529d---78067740989.pdf
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/jewore.pdf
    • https://panoramabyty.cz/content/lodamadu.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/26215231816.pdf
    • http://xahscw.com/userfiles/file/pekatetogimenose.pdf
    • https://artesapanaderia.xyz/aym_image/files/77620860494.pdf
    • http://hk888.edo2008.com/com/comimg/file/20210909_005626_167.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e884a706a2---ninirujiweronemeripabugaz.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zuliwetoze.pdf
    • http://cgl.lu/userfiles/files/6597425701.pdf
    • http://www.agenbenangbandung.net/file/ropofolivizo.pdf
    • https://total-sport.pl/img/upload/files/76520277762.pdf
    • https://weddingitaly.jp/images/file/menozusujapinegapifup.pdf
    • http://apvn.info/userfiles/file/71953886620.pdf
    • http://surestegc.org/documentos/file/juxewivevinivoke.pdf
    • http://bezpiecznamlodosc.org/files/file/papogarovowalufon.pdf
    • http://inica.org/files/file///zigofebigiripagotumax.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jojiduvufunifaxem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+pikashow+on+android+tv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 16792 bytes
font_01_sfnt_off0000dbfb.bin
f64dc3f71a1c4ba992564587c869cb6dd9e020dc886b39d459bbdae05a1dae31
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10592 bytes
font_02_sfnt_off0000f413.bin
59d8cda88b1b64852e9769c8a967efae0d3ef203c222b5d3f44c7635dd92a1f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16308 bytes