Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5206e48bfac8a03…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 17:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca18dca0d558b85878629a661a1bfbcb SHA-1: 57d5923ad8234df9f84ae158b7ab6d9dce80f03a SHA-256: a5206e48bfac8a035addf5bbbe6ebeeab25a59bb9800e63bca3068a485fda4d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://philabc.ru/uplcv?utm_term=fifa+14+mod+2021+android PDF link annotation
    • http://www.gulbaharsigorta.com/contentData/file/91446035581.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/74558171262.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8e111961e66cac3072bc2afb3e7a6c7c/logijotavusajuwigupaz.pdfIn PDF document text
    • https://nls.vn/upload/files/lujefolipejapafazun.pdfIn PDF document text
    • http://gaudi.tw/upload/file/91409814888.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/68362730813.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/vapudesevuguli.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631603286.pdfIn PDF document text
    • http://kezmosas.hu/files/file/bojerapam.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/jipanurupupakaxelok.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/47346419660.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/9781725015.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/jofujupikiwojinimuboxi.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/rewipo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448a65f111d---36787205788.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/95486478538.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/402558552.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/namujo.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zeduvesodimek.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kuxalu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f211cba457---kekefudikukodibaxofe.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/73395226383.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/30133579002.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/67554691284.pdfIn PDF document text
    • http://3sdent.com/upload/files/95255603300.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/85099914714.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210908165610_sifbla.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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 10420 bytes
SHA-256: a8fe4b5835822ed594fc7b18b55f7d194dfd5191e1433e535c456a4c2055b6ae
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 16932 bytes
SHA-256: 5faeffb00527de75ddd6049be37aaa00f147403950f57fdd9a0bf9fd22a14e74

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