Malicious PDF — malware analysis report

Static analysis result for SHA-256 5480a2929f9955c5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 02:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a121ebd4e7541027430aa5b05960ab1 SHA-1: 391c855ed3a187936adee486babc7f81669072f3 SHA-256: 5480a2929f9955c5e6bc0610ff3d52baa1938a18314ca18b6a917de43d6d6d5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=keto+meal+plan+on+a+budget+pdf PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711f7df2e0a---nofunagogunogedeveneluw.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/xirolu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb86aefa78---28336651676.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/gilobitamivukulesix.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/vixaw.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f1cca0231---lilapojerisepoge.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kifjc4ihod0kpefqlvl7a7aui4/roketiranuvobum.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/69868977461.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3d5138ec40819b3ed6f5a9ab8d5d1dbd/jutuzasuwonipawaluw.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/80640799712.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/sidefopewafefesifaga.pdfIn PDF document text
    • https://digireg.sk/upload/ridagubo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf22baeec2---puzopuj.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/88790559773.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/37262779508.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d48e2049aa---75347069833.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8f2d817---56095196880.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/60532658780.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa88649721c---54279566383.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/kujubasepufoz.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gejukapenome.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/39407933376.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 14616 bytes
SHA-256: 7c86ce16ea08b411e4eb70eafd4d88ef98d2f97faab0e99a7874c33a7cb45a94
font_01_sfnt_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10712 bytes
SHA-256: 47062ebab8d5e5d82fb92a22ada8c3e7f16ea2283babd86ff2fad00e405e2fa7
font_02_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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