Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a4548e606883a8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 22:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc63901c1ec2197972d69e4e45065677 SHA-1: 171e0532eed1677f1335ef6423e3baef4e08f82c SHA-256: 42a4548e606883a84ccefbe1c8f37f788aa285248258b81a1cdc92a96ecc113e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including WordPress upload storage and disposable hosting. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://drafthe.ru/uplcv?utm_term=tablas+de+frecuencia+pdf PDF link annotation
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/garovezawevosejewerojojok.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/natugipekedojapoji.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/6994403657.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/wulimetopakolapurugubef.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/6130617499.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c7d038bc---13524871418.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/netogejesojaniz.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/19261679642.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/pidewuxobozopifagipedi.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/pofarejijikokotevedidaro.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/51693403714.pdfIn PDF document text
    • http://enewind.com/pliki/file/sonikogogenavedotefa.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/vazasosurufekimu.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/maxoxagegemaf.pdfIn PDF document text
    • https://mklaassen.nl/images/file/43793781375.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/mavoxuvujategufadeba.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/vexolenofigarovi.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wowamufele.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/28110460169.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614788748f67b---gegukomadujekorotokowebi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/96415679444.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dd891cb13af2aa2f4b6170c482027f2/xetewimevufuburene.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/13637618981.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_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 10600 bytes
SHA-256: 792ade8ea3713b71dd030f58227301931df802277ef8ef2dc373baba22cd9c73
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 17836 bytes
SHA-256: 336de80ae88642e0ee4522ee259363c3622b641dd28f322155cde25d16134c1c
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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