Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca54c52af4ba9c0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 12:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7119b3cee9dc4aa4f4365bda5ed573c5 SHA-1: f5f8891b03a3c6c18f39659e7e2a8ea17a706d3d SHA-256: dca54c52af4ba9c097f1f72f8b189eb593a833ebf08c947b672f7648a92b8682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=kotob+arab+pdf PDF link annotation
    • http://yuhao-tech.com/userfiles/file/wajigapa.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/12074745702.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mokorusadi.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/15425881532.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/87420480535.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/17972920989.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/87366601882.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55241162650.pdfIn PDF document text
    • https://jurad.eu/files/file/32298077946.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/97752885448.pdfIn PDF document text
    • http://orrizon.ru/images/file/domojaruziwurolexo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/menesitopisisemawo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/50332376860.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nexaraxixulipirufuti.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/58se9c74gcm0u9la5llv8r9kr6/suralerazizorotosizod.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xijuzoriveguleruwoxuma.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcdce1e37c---mekimuxizugagimodigav.pdfIn PDF document text
    • http://szwygs.com/upload/24989305903.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b391d21e---25734900708.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee0bb97ad2---madejasalax.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/92112842426.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/78840728888.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/vrhti8jdcha0dinteevc813ef2/zotukiletolev.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/kawaviwekunusimodarager.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/95666755475.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16115a0e20e8ba---73516671904.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed907f74f85---63882078030.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c5d8677f8cfa61ba7403bc514f2b9bd5/wazuvopomipanik.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_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10080 bytes
SHA-256: 85536a05e0e989b3f67ac8df20ae0af1ab0b80159c03bfacf265921db39ced83
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 17672 bytes
SHA-256: eb85118863ac122db3694d9fffe901429fcac4f481e7e117e261efb95b1fe5b8

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