Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d40a28508a59c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 09:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6587c6575b5a328eba9691093e0d70a4 SHA-1: 2214f9141da5c56a3e4377125351d40a76502ed3 SHA-256: 7e3d40a28508a59cbf8e4cfd4134d7e294f4c6f07af19ceb537468c938d9c07a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=color+to+alpha+photoshop PDF link annotation
    • http://pajurioverslas.lt/ckfinder/userfiles/files/67020117795.pdfIn PDF document text
    • https://777mto.info/contents/files/xuxawadijonulufuzetetufiv.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/5400700427.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/murfu3kdmfqh7h97rghohvq9e1/2255245085.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a1803b0d---jixetugomujoboborurodudu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/58837819213.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77bd49944b---luzegovupizarejixanulages.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/55365178829.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea4830280---busimefo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fm6cvjnp114ov2c9rru15mun05/22302369767.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/pasubabejefewoworigo.pdfIn PDF document text
    • http://remobudostol.pl/pliki/59832439683.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/68869848281.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/87299909134.pdfIn PDF document text
    • http://houselandia.ru/files/labopibivixi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b877ac636e5---vuvemubutetomipafugixazul.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/335a1d9463a109fcfb4d05009360eba2/posuk.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1f311d3d---vupalagevomazitezuz.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608524a3e0a1d---xuwuzesa.pdfIn PDF document text
    • http://philipsphotographystudio.com/93871062816.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zavogomuk.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jerezopavom.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vapex.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zuxizun.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108181958015548.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a065d8e49d9---17394096449.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/mexizenomazi.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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10052 bytes
SHA-256: d7df0043aba9a2afbffe9fa06db38956e4cb1fdf2703504f0ca9a63a6502c6ee
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 20024 bytes
SHA-256: 093fe0c9b76de9d5ee9e61c2266680883af7669bf0fceb0bcd6ce088660fdb2a

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