Malicious PDF — malware analysis report

Static analysis result for SHA-256 f368a54a1e303349…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 00:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f395aceb3f0c8d505b021d47616b89ee SHA-1: c9966c86bf10bc0d316acc5f4212416b1d426498 SHA-256: f368a54a1e3033492dc58d5a6cd8208e0ef87d16cfc80ece91a3758a5a76eeb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://jcnjl.com/userfiles/files/xubefiwesemok.pdf In PDF document text
    • https://advantagelic.com/singhania/downloads/file/zibisirebowuna.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lc5i0tk8godsce3mts8cn50gd2/61531392519.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/41404387009.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6r4vdjm6m4u0eh5hhtmvi43ufb/96047753032.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/gadarexugezudaguretu.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/97239751762.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/javewefipexuwomovigaf.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/rafaxalera.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/78704171498.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/30975342027.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/62945481581.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/guguzenegitiwe.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/97345906027.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/vumofigabadosedalagimu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/40017629669.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/wuzadonixovabuzo.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/situjako.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/308778d957bc6d2c0cff9f84ad28004d/49903675801.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/sipepugodugadediboga.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/dixux.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/85056232148.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/73004423154.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/36685497948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=apk+porn+sexPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 10020 bytes
SHA-256: 41cf67ba4ac4aafa939f9761015129b333e32db95f87a4edbfe8b1d2186e9291
font_01_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 16732 bytes
SHA-256: 9f54678a366b52b1a7cb3ddb08a15047a5aafd82f42d71d63ec1123f5420aca2
font_02_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1