Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7cdf3db5ede0be…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db18b11a8f4c00afcbcbc2f411d3d4d SHA-1: ceb70727b9d1e36f1fcdc1cc017929d6abb7b3d4 SHA-256: 3d7cdf3db5ede0be6ec797d77bcd4ce88f5f6bc3bdcc26cb117bdc91c63e3c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites and disposable domains. This pattern is commonly used to distribute malware or conduct phishing campaigns by redirecting users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cordovajewelry.com/images/file/25363345618.pdf
    • http://wahluenfty.com/userfiles/38611313225.pdf
    • https://augsburger-dartliga.de/uploads/file/jivivigepofod.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a5bfc366de8a8dd829fb7ed278d5b993/fujopitagugimemimofonan.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3180b41c80b5dbf97ca2200ee6d71460/20591328461.pdf
    • https://loctra.net/userfiles/file/15147384935.pdf
    • http://www.thaiboat.net/image/upload/File/73716670187.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0c760d72990768e82f3ad4d10cfc77ce/28755413381.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72d3011f8---roguvadekapexerisobazagek.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859673df1c8---fazemesej.pdf
    • https://dhcom.vn/userfiles/file/xilozadatisop.pdf
    • https://htddienstverlening.nl/userfiles/file/buluketupep.pdf
    • http://ajivikafinance.com/userfiles/file/jurimubiradefu.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/besiduvisiguvezowo.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/gumorileruzozudosuki.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8f968c36ce09242dea33ef5ac83da16b/fufij.pdf
    • http://grupophi.es/uploads/files/93453876734.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2p9nu1s8k7jnl32pv1j62i7mc7/tadibajedopigiwatimenuj.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608085c2f081c---79265138701.pdf
    • https://protradingindia.net/userfiles/file/35044709282.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6e634e2c9693b78234412f3d2339c50a/27851165563.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8ac09455---fupego.pdf
    • https://edubox.mn/uploads/users/0/files/xowigujoz.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad944698f19---26435166136.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6751b3148c---27032333524.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/l3luv69lqko2pehfjdu5nqtiok/54750526365.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d5886ff7---piwabiwerebigulosado.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=section+21.1+magnets+and+magnetic+fields
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 16792 bytes
font_01_sfnt_off000104cf.bin
1a3a3c3d7e2954a63b2aa5ae5057c10b1728f8e019271bd04f394078a8a7864f
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 11032 bytes
font_02_sfnt_off00011e59.bin
4e426387602af9fe6a3ef543384e86bba8a0120579b609d74be3cd75a4935071
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 17148 bytes