Malicious PDF — malware analysis report

Static analysis result for SHA-256 0768e9d087187840…

MALICIOUS

PDF

90.5 KB Created: 2021-09-12 18:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09b2cb2b2977ef8a99c398c78db31fd3 SHA-1: 907b8de26dc8aad2c99c7c06808ec92bca6b3650 SHA-256: 0768e9d087187840a3030d352c6da6d9c82660910b23c717258410359feabdea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://inwebjor.ru/uplcv?utm_term=lingua+araba+su+android
    • http://mtt-association.fr/upload/file/guboput.pdf
    • https://majubesar.org/contents/files/907430840.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2e8809fa7e7c9ceb4fc10781d99aa9c3/56052783733.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/nipozenikogaruxe.pdf
    • http://diagnosticaedilizia.com/userfiles/files/tepevi.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/76925429625.pdf
    • https://agape4u.org/userfiles/file/52243519038.pdf
    • http://nessie-vinylcare.com/file/kagizoniko.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d3ce3d4f---papaxodipaf.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/fivorepofirufenokaw.pdf
    • http://wirtrauenuns.ch/images/file/53667435801.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131617bbf5ec---tedupekupoxelorebibu.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/26bf80d45fa8a76ecaf30bd2b5396bf3/30864437652.pdf
    • http://rakkhunnursinghome.com/user_img/files/nobebofejawusowufugij.pdf
    • https://bocion.com/ckfinder/userfiles/files/sefaxutanorizezenoropef.pdf
    • https://campermagazine.tv/public/file/506393630.pdf
    • http://cabini.it/userfiles/files/fobusozenupegisakanogekes.pdf
    • https://jagamimpi.org/contents/files/82864024896.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9lfbv6db4vpgdkk4hc3lu6hhbk/9769887243.pdf
    • http://minhanh.com/files/88911923219.pdf
    • https://edubox.mn/uploads/users/0/files/16172641974.pdf
    • http://maymaygiaydachidang.com/upload/files/39831017393.pdf
    • http://agro-vostok.ru/userfiles/file/86370970452.pdf
    • http://pc-driver.ru/userfiles/files/nexujifipusemujakulubojun.pdf
    • https://natyabio.com/uploadfiles/75606060608.pdf
    • https://jingchengs.com/jingchengs/ckfinder/files/20210904180347.pdf
    • http://resetimpianti.it/reset/public/file/jevagireduxofa.pdf
    • https://digireg.com/upload/bozalatoroxogagorusakukam.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94b.bin
d19dd64c8aaf86d426ec63b6a1048c547030c135f4901bc3dce84fbd43157ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 17992 bytes
font_01_sfnt_off00011720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 16792 bytes
font_02_sfnt_off00012f31.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16140 bytes
font_03_sfnt_off000144ae.bin
f82dc4953347bb9f2c4b6b765e87a6d0baaed3f9e1f6e369a2cb1c3b580cb812
pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 10344 bytes