Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ba022a45043aab…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 20:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ea3fbbb1f8eee334e24776d720ae9d9 SHA-1: 5442d6bc1bff59b21c443ec2234ec881d79a398c SHA-256: 56ba022a45043aab42df7843c4b733399783d3720d4e6aeb7a23413bde675fb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious actions within PDF documents. The presence of multiple compromised CMS upload links and link farms on disposable hosting suggests an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, indicating it is likely used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://saveursetsavoirs.fr/image/file/20086237458.pdf In PDF document text
    • http://veszpremkosar.hu/_user/file/sosetonotinesuxef.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138169f44053---76355813728.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/89859806749.pdfIn PDF document text
    • http://calisnt.com/uploads/files/25366904271.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613639881b91b---36587303896.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/nuzupugupadubefof.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/kotubujedibita.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/61654605396.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7af78b92de9f927ff52b5d58831b999c/levigex.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/8904831012.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/73461001479.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/45135911537.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/lilosuvexawubulu.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/48680747357.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/laruzitomidukefuf.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/pobavorewomod.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131c68002763---89998687101.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902083749_98jj92.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906235227.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/72670308051.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/79317834660.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/70510450211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+golden+compass+book+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10972 bytes
SHA-256: 1f89467c3f05640470765503ab0a37860f49748c4ebf36d0663180551a27bd59
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 17884 bytes
SHA-256: a99eed92e47bd202ab6e2cb74bec5119810094f27b9f8a411ef22e3287111106
font_02_sfnt_off0001335b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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