Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b2bec557fcb98a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 01:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b6f6dc6e04fe7f29916a1dbeeb1a089 SHA-1: 6a80270c81b78c2b7e445106eed7ce5c69432bc3 SHA-256: f9b2bec557fcb98a176225ccf21c7b025e3590e34dd53f7d0ba7d225133a13cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=what+is+the+difference+between+ios+and+android PDF link annotation
    • https://lixtech.com.tw/ckfinder/ckfiles/files/65249148400.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345acc2a761---rifulobafixigawovisetiz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64422767984.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/52590600932.pdfIn PDF document text
    • https://tessuno.com/upload/files/613976c1db713.pdfIn PDF document text
    • http://mastervin.ru/files/file/dojusuratewiwabis.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16999637991.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132cae17aae0---31234425850.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/26594247432.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/18087083181.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/13590755670.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rujujixezugexewa.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/lobirafazaxapegajom.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vopax.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/60561421677.pdfIn PDF document text
    • http://surausa.com/uploads/files/voxapimivulixebuf.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/tujaxazivudevusobo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310724f3021---30751057512.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/22858167464.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/21561049679.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jusakikapimegifukanedawuz.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/56755563740.pdfIn PDF document text
    • https://pellevah.com/upload/files/6085850143.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10744 bytes
SHA-256: b638477f33230db43dc2bdd3421a9e105345c14c5b296568bd2d983316bfc2ee
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 18224 bytes
SHA-256: ca542ef5d9d2b79a0076181bb8102f61fac851f5bdd700e2f4710e856be70470

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