Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4a13665421f43e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 15:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 655a56850cf6958317fa373fdf7b7e14 SHA-1: ab2af12d57535ce702a2db2d97cbb709d25a310b SHA-256: 6f4a13665421f43eccd4eaca7b1358d21fe7dfb2962edef2c05986e2ad738d24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=the+first+man+in+space PDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a10bdfc8712---13477157662.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/zigeruk.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286c947674---54500918960.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/29374540404.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kitaseserulez.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/44307545501.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/99807197662.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/nilezasitasilusi.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce0e1bfe---62552486497.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/21594620622.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110f88f48be5---45293978038.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/19166738251.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3190ca4c13109cf85f3724d6e81cea47/bikifugunadotarirefopop.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/27078068695.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/lupijixojadefotiju.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8mlg6kib948jjp6kjf8nj5q6kn/42252556496.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210724211836.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/2427592848.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/vipoteguxifaxal.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086249e40888---41139332746.pdfIn PDF document text
    • https://lasanisports.com/files/putof.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6093d6cd5---27490490577.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dinugevimo.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tival.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072f21ae0d---70007129690.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_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 17192 bytes
SHA-256: 02f0650f2bd36e92adec935816bbb941aaf0d369969aaa2964d1b91a66640962
font_01_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10540 bytes
SHA-256: 346dbb7768dc2bc0f37f946da7008976bc0f973e6ba9d5d1d00740a9f025c614

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