Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaed4228cc1a1e2…

MALICIOUS

PDF

184.6 KB Created: 2021-06-25 21:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 10fbc001df53a66fbe33112abe6c583f SHA-1: 4f41d317a57bc52f1511d14d1627843507fb0fd1 SHA-256: cdaed4228cc1a1e20e892b1223bc4e254488a8bc79dcff3f10dd6abd6b76199b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ls8u1cvr74pgh5uhn7b81p73s3/kurovove.pdf In PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/ritaw.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/nirotexuwitos.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160741af1da15b---20260440848.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e61f70449---20626518872.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/92331735686.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608177e3f0651---pamosobuvip.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/309g3q2ur501v8l3ojgchd3qmv/vaziguranilepowor.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c2cofbs8t4vot7i1htn6i0uelc/54905899077.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/merixuj.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/50150730562.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/5800422849.pdfIn PDF document text
    • http://sam-global.info/files/file/vusimixikepovinebamasuwa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fe08a096---18289333885.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/kosegedozefabebelakikir.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/41c053ecd7a4ccb5996be85377fdec41/47314993674.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/84638679654.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e113d00a5---84374296910.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/nutasulojeraruvebeno.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/nupizubusovuwaladu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ad9a91f8dc86e5da36864877a66e44a4/93081602581.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2ebe8cc3---xunudiwor.pdfIn PDF document text
    • http://vodnik48.ru/content/file/beneziwive.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74412aa67---tezawakewufamo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/22126680156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dua+for+protection+for+someone+elsePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00025027.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25027 34640 bytes
SHA-256: 96181529d45b4e95c89efc6b71a398d4d932c873a77e870a7b295927116a9490
font_00_sfnt_off0002377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2377F 10740 bytes
SHA-256: 5924a0b4166cd7d2665e6304ef1547e74924a71f057a50de63bcd03e67e3ab2e
font_02_sfnt_off00028c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002a4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4A8 17808 bytes
SHA-256: 2081bacad53f54bf21588e5de6345d0c91336fe6efd4dc1fe65d6b8ec519bb7d

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