Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a143d6ff891cae…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 04:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d85215456a17ed8ef28f402228f830b2 SHA-1: edad5a6ca4d639aff26ba37d0527c90c892c5521 SHA-256: a9a143d6ff891cae035c2d45ea7e7bb4456688fab2a6425679af2c4f352fe7fb
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a remote-support tool lure. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting an attempt to redirect the user to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific instructions, but the presence of the 'SE_REMOTE_SUPPORT_LURE' heuristic indicates a likely attempt to trick the user into installing or running remote access software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://garglob.ru/uplcv?utm_term=alexis+de+tocqueville+democracy+in+america+pdf PDF link annotation
    • http://smm-mm.com/uploads/news_file/92352266405.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/54084068892.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/5868149864.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/80958117430.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524cf4dbabf---75695966267.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/92540665631.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/27822782126.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615235589825d---46731342951.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/lazixule.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/399b1f3b077e7b2bee1776c144151394/xisit.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/domog.pdfIn PDF document text
    • http://hijoin.hu/editor_up/vovasukaxikek.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/xitatuxametenavujilovixev.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/22140550349.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/11741784861.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/1141818271.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/98320209776.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/18301715404.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210920055613_1806389674.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109261934144529.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/55284252734.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/wosabiberuvesabuzikoviz.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/83929798655.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/tabon.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/kusiwazasepowodevogiwo.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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 11292 bytes
SHA-256: ee565fc156cbd80fe8b2a5eea01c2785bc823d5f770d2fef653ac0f99e2f25b2
font_01_sfnt_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 18616 bytes
SHA-256: ef9c1add359ec3426f2cb0a69a776490ccd313b681a9bc1654d76fc82e3b2b32

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