Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f53e98c9c53450…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 12:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c89e4960f98756f49486f27519a9603 SHA-1: 64e67cbc524013b965afc90c9dbf99d149a1d831 SHA-256: b2f53e98c9c534509d29948d1efd5d0207590b227c25ce33e50b1f2d57a4fd17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=android+menu+app+download PDF link annotation
    • https://petikdaun.com/contents/files/febevokivitasamowaxoxidu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/80202032520.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/44761953869.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/12494192202.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/46986683021.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/24395310437.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/54862212624.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/83453017123.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/27164714104.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141666bd553c---papatadidizarilamojewoxak.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/naregisovigegafudulak.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/tilabatolizu.pdfIn PDF document text
    • https://jagominum.com/contents/files/60397636197.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/89773629039.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0b9b63db---nuzim.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/34465730751.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/sijepanakaxavu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc08dccd3---beketowaw.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/fununaboso.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911160801.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613fec011a14d---22926182193.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16132aff352cfe---posem.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/banazonuj.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/vuside.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/lebedaboduzib.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_off0000bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 10452 bytes
SHA-256: 95cf117c1601406197f7e39d77c3f5a164725574204b6b04ef07deb1a3c6edd5
font_02_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16560 bytes
SHA-256: 07ca8e4077c391f6accc259abf10469a55ef822e4184ee1d21c277680b5f0709

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