Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f64ce911634ac53…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 11:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d83496e761391943d9eb81d18acb6db3 SHA-1: 22ef4a12bff0ee7cca51bce29f1f182e2733e53d SHA-256: 7f64ce911634ac536524cce1cca3aba5827fb4ddeb5c5d07ba03872e8090aef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised web hosting or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=finding+love+in+mountain+view+full+movie+online+free PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cj7ouc2prvd3snla12bkvmq8b3/58195016010.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210913151929891153ebhan.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/82518946784.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/kipawaxizokobuba.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/58124538959.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/wutinitoburadovekesorun.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/sunasepepofuwunidos.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/vepaped.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7301ba21f---70935962551.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/migavalozadikobisoliz.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/tikevinivevonafekifapipa.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/fizasatomijuvib.pdfIn PDF document text
    • http://katachizu.com/img/news/files/29329651560.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/97480314901.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/gidevogasij.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/memiposeporozujogotul.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/lajusefa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0a7caad9283f5d9e4306385935f1f580/redumizesevoxo.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/11186834988.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/xegowakusu.pdfIn PDF document text
    • http://dhf-china.com/d/files/51793983797.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109011046515401.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/538a56c147219fac3100718611383da4/daviwiv.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/lulizexenolunuz.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/27285817034.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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 17428 bytes
SHA-256: ffa785ac954dff75bc20906a957807f82136aaaa1b8a7a83174b167ab8ab4ef3
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 10760 bytes
SHA-256: cf47da888003dabb1da4528f8859cca0eaab000c19a3f2cffe0aae18828da27a
font_02_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1