Malicious PDF — malware analysis report

Static analysis result for SHA-256 c044d47f85e30920…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 18:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f32c529ac25a1fbd2d6397e7c4e3b93 SHA-1: 4b69410838bbd3749bb7473c14db41079e7dc14e SHA-256: c044d47f85e3092060ad723349067f827fa9b48c6460b98038753a2e651d9f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=block+text+from+email+android PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614575312b695---76345660516.pdfIn PDF document text
    • https://digiconelectronics.com/media/melukorajulivebazabo.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/wiwitosulawefiruvaw.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sebopelejapisom.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wepudiwomovo.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/48094331634.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/lasamowudaraxojojeliladu.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/bukixulunasesilifugu.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/menagulawatazi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/99006227781.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/65822418360.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ti45a9r7vrmunprbm4f6hge6tf/jivafanozalepa.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jovigimoluguvukujekog.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/ropobusofajexepigogiziwi.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/99889977469.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/1581326707.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109161412382726.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/pibejigus.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd8806513---69029900833.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/93164491616.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vuvaxejegusupivamizilak.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/giwijilami.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/16683958471.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/97488355496.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_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10716 bytes
SHA-256: c9f17c25608085cef671aa60c52d5d9cfdcc903068eea989738106b38c3bf6a9
font_02_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 18640 bytes
SHA-256: 9c3cbea02ec23577872d503d847eb86f967249b4454eb0bf4b0d3b7b7eae60d0

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