Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2f54abb5f15fce…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 10:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec52b8e0df2fb191ae7856fcc436b31e SHA-1: d7438f9956e1149779a8a8a18b16a5070dd97ba5 SHA-256: eb2f54abb5f15fce9e76e336f95ddbd952c23a960ee60edd37ab253f078d269e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable or compromised hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://onecre.com/images/content/files/69528594678.pdf In PDF document text
    • http://china-baby-clothes.com/d/files/bemujobujesifivibifuwim.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e001bd5cde---1400742394.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/gunavitobifer.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/xodosov.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/65111354897.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/62289298370.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b533b12426b960e109c1ebbf0530a690/59794544926.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/31440071247.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_0A466D22FAA5A4DD.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/vorubikatuk.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613318c4777c5---fasoga.pdfIn PDF document text
    • https://network-italia.com/file/rolizopivo.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/fojakasag.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/pafukefavizilumolax.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/74637996019.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/valitemezinepuw.pdfIn PDF document text
    • https://pellevah.com/upload/files/6085850143.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/matipuleb.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/vovemexafu.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/67848978462.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/49943565833.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/84397770775.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1b96fcb7052150cdfd428ca252ca533/fobaxufetomumimetifon.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/52261817430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=35000+naira+phones+in+nigeriaPDF 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_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 17188 bytes
SHA-256: ef4c808aad9876a4466cc68312a4600d49d7ca3937b17e09fce68c8a4d31ff27
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 10716 bytes
SHA-256: 1e373e9dad5ba217dd252132cbe3940865f57b0e21a4535579657825898532a0
font_02_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1