Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f563e45e6887e0…

MALICIOUS

PDF

107.8 KB Created: 2021-09-08 08:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5722b94ef267c1c75b22f56582ba908 SHA-1: 98fba0bdb6177cf692269626fd41e8506c16a331 SHA-256: 18f563e45e6887e0b10854a555049115f6cc2de47c49862847add83bc0302e82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. These links likely serve as a lure to download further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ac2e5d256d8b4a860ea829334fb09f5/xurazosale.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d6d2f3629---28642618492.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/78095546827.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/ruwejukubis.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/34973967333.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/sapawotasim.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d7ee11cb674cc8b2d5c6cc6b7e1be598/30613975743.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/97678261809.pdfIn PDF document text
    • http://poiskvod.ru/images/file/50131457988.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7vk4ta71hi8s6i2m5v1kg76i14/mazuwifewagiwibivaxoj.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/67443727217.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/lokirigelo.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/xolobokeju.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/nebogaxawuveriwili.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/sofopaz.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/92357823911.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0i90aj4lf26t0o762ovc65ahuu/jigamizetizekupud.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16085747564873---65232264077.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8b5b64b300f1befffa3728b3070f247e/49939442864.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/2550637330.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/51713334492.pdfIn PDF document text
    • https://thepainter.asia/upload/files/26159324803.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a334988135e---bexoledabaraxenepum.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b71940e4e7---pozezixiwi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/984928326eb1b97be0b0ef8849c79aa7/dafifovewalezinarezux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cold+case+homicides+practical+investigative+techniques+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001524d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524D 19560 bytes
SHA-256: 7a28ad65f611993edd2b28966edeeda0714ee78887b322fec1f27d794f25dca5
font_02_sfnt_off000184e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184E2 11412 bytes
SHA-256: 360cce6b4349b93f100920ab848e98d182f2c4a6842dd8e8dfb534bf8e91a61d

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