Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e8b2ef6e5c440f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 18:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb3c5d546217277628afc44c25011f66 SHA-1: 8c09b2aad21e88a8084476bbba56909fe1f03e56 SHA-256: b0e8b2ef6e5c440f147fb1a298f86e7c28a7a040ae2f119ca71ebf92592bd7fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this assessment.

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://garglob.ru/uplcv?utm_term=how+to+hide+games+in+android PDF link annotation
    • https://satesayap.com/contents/files/pazuvizi.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/judutumolo.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/19195502514.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/59549817003.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/supawunaside.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/pedawujuxovikok.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kalumezizeverax.pdfIn PDF document text
    • https://semut73.com/contents/files/93439310569.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/17828222215.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5fa845b0905e3bad21dcfec59b343be2/84563929053.pdfIn PDF document text
    • http://imaginove.eu/data/Files/93596748460.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/witupabufurinajonosetu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a1c2736a---57873633227.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/vuvezumejebanepepoxozuviw.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/70155196682.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/63727219496.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/budebugi.pdfIn PDF document text
    • https://remini.hu/userfiles/file/50943468587.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61340cfea30a9.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/fireliromumemukesekoxi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc923a283---65722181001.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369a3b312b8---vatuzakamabeta.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/14651616705.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/88307746214.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 10728 bytes
SHA-256: 6c9fe55074afa0a84007e78b0cf67326ef6d4e70869709fd8199f6512c05f747
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 17480 bytes
SHA-256: c26bef35d48bd5d545543c9f4f55a2978886de0bcf51e2b3ab74e4fec3ae70dc