Malicious PDF — malware analysis report

Static analysis result for SHA-256 73657352493c51df…

MALICIOUS

PDF

216.4 KB Created: 2021-06-17 17:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3351e9fff8fccd5bb9644b99f0e711cd SHA-1: 64c745674b55bff6ef253711c9c56abd2828107d SHA-256: 73657352493c51df6a0ce6739eab953690336c1a8e1b92455e54322ac64d94a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which host other PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=play+club+hf+patch+1.4+download PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e4dcafd79362957825cbf5aa50040c5f/bexawelebozifiripetomu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2j2ammno4qcfbbdf5k68lth6b6/leradatemijapajagesu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/96c4bd2017b364e8a86fd6618bfa5b2e/89688792390.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1d2gd40a1di88q18ul16d137sh/56760764196.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec437bb866---viruvimofob.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/lr93ip61tljdt2nl5v49f1hb0g/50689986804.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hppa839iirjo2capjhhj1330pk/nejuvimu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t38uee62f65bu101t1je8stvn0/bumoderozosedejajetidokod.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/82266456115.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b237677cc37---93565150840.pdfIn PDF document text
    • https://keongracun.org/contents//files/57407328496.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/e8pimles36uf5miiugororpu61/vupudufovedabifujam.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1df2abc8f---xafepu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/bajiribobipulevesixekube.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf83fc9e99---27904504139.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/vogusamozuxiwali.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/53509612999.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n647flgcjjub45aqb3tcr377d4/lasobuzogunawofawajanom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5A 162084 bytes
SHA-256: cc9b870310fb557f54e8e6c661cbc383a43892bb8e282cd7e1879395d8361bbc
font_01_sfnt_off000318b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318B2 5476 bytes
SHA-256: 9ad5de12107d88d9a4dd4146bdddcdd4324e834d7719fbe9dc5a482539489956
font_02_sfnt_off00032b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B77 11584 bytes
SHA-256: 8d3af296bb334aaaa2bff70d65d855f2f76bc01d86ffba961f69afea57631011