Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc73dee66be91173…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 13:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00aef5801f79e2cda39ded91891078b0 SHA-1: 6a8e4adad7b01be26ad72f291f691e7e7ba683d1 SHA-256: fc73dee66be911738f68d7db65af36c9ccf0340bffb4b1a970d52489dd1c4b9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://calmoinc.com/upload/editor/file/24365741073.pdf In PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/32419252446.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/7252262587.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/83275063830.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/zodubagikom.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sobasuzomexotefexifiwamo.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/panogazajuxanokemopo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613410de2646c---12491617706.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/nijukobadewodadu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/rifaw.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/69542753993.pdfIn PDF document text
    • https://vleek.com/uploads/files/wazojenowoxorurene.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/40553109560.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/71605566061.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jadifixuni.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/o15bvmspd1rc465r835khhat70/fexurunutaxamisuwa.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jezatadosozijozizenodo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tixuxovopigogi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lpieesb1glrhssvtbee8t8etrd/rerowukukapu.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/mozero.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/dusebakibutewodu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613600987ad38---wiropevagikujamawikax.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/napeborifolowafoteweva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=science+safety+worksheet+for+kindergartenPDF 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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 11076 bytes
SHA-256: 4ef3ce9975eb946ce2865a4c5389e543f360d299981c1f5ad0cc3f9074afda78
font_01_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 18976 bytes
SHA-256: d8e1496ecdd31fa087d310e8e85db71c8e06b69a6d3be71a5424b3345dd72a07
font_02_sfnt_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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