Malicious PDF — malware analysis report

Static analysis result for SHA-256 5645b35074c65dee…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 00:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48a4a073c26d14f3b5902de87c668c2e SHA-1: 53c3bab60a3f6506415702e64c2dfbe4579fb9b6 SHA-256: 5645b35074c65deed90856c3868bef4816a333537804dcfa76ec52307cd724d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://nomylo.ru/uplcv?utm_term=nude+teacher+and+student PDF link annotation
    • https://riolospettacoli.it/filesUploads/file/vajimijirupasez.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/jokokuzezelakixuxi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cdd45d88---zesoviradubijataxef.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f47d97b0819dfd029468e3d7c660da78/gotobunimavojip.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/30016939204.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zukajemuwubu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc11b3735f---bujozusakajenepuv.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073b89e3fabd---movazibiposamulaw.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rifafodid.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gupirowuxofofabozu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/kezisizizunakomepu.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/lijevisezeruf.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/8at0gstgkvqj4tld85sl3gmtut/25445351071.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/77930901643.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l3tnu7ckg8ffvt5mrb0iigs5h9/nameturovigapubupigoxipu.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210627131926000002e9dwjinrlblv.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b20d7db11---rufeguretal.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/47589063152.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/betogabipamogajiweb.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/zulumotoferugisodegiz.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/57293009629.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa90e94aaa---gavexodepobet.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/58551669861.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/57244642398.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/3136602130.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba4053f19---gibudefufoveru.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_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10284 bytes
SHA-256: 00845022c44b8c179b0ba8bb11b2d445148904bb2ceb1e4e1e5bc7d98d97c142
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 17808 bytes
SHA-256: 280082cc4b05cb1b2b7ddbfd9d13c76d5f76e067fa9758fff2da11164ef95da0

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