Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a67210c22481785…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 07:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22c9929437c3de86fb793d281da2a731 SHA-1: cef317aefc5b6eb1cef018ba8419d3762bb24f61 SHA-256: 0a67210c22481785a5f4a5f911657d8bbe5fc1fb656ac3c7054b873f0e7184a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous embedded URLs, many of which point to potentially compromised websites or are structured as link farms. Heuristics indicate it's a link farm on disposable hosting and a PDF phishing trojan. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=flix+tv+mod+apk PDF link annotation
    • http://studiotecnicodama.it/userfiles/files/zatagukolo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/27083028964.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/jesasakolopetovuvakipelav.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/fizim.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/90062146564.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/tivogatabuxukasatuvupav.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/32432453850.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e56e26ddd---11745754542.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/48159951524.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/fufiriwopu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda54a3f36---68381438660.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210917214203_2012790854.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161444f261a269---negumexoxufimajaloxapa.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/51094465444.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161345b435e0b8---1652441528.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/fafafawofaxivobuxukex.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/sigomodamagesavexeg.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/47569662666.pdfIn PDF document text
    • http://fivelscope.net/fckimages/17174673351.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/megimuzoni.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/rafegoxubariruzunopux.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/febabi.pdfIn PDF document text
    • http://expresskaliski.info/file/gowalemavokobo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449fe407114---56070258773.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nadobaritotov.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_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 17052 bytes
SHA-256: 80f9f902186f1221e24bc7e0a2e5a5e41305b6e4edec2de96c3d6c4abc8d3154
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 10288 bytes
SHA-256: 640bf13a62c4a612f248f1507ce9914b09cbf75298877fd2bb63cbcb110317bf

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