Malicious PDF — malware analysis report

Static analysis result for SHA-256 300648903e4c7854…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 06:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa6502e6b2cbf3e7202e2878a4c9462e SHA-1: afdf6ee026c8d7dba0423fe14bc48c6dd70e16f9 SHA-256: 300648903e4c785438042a6ce4e451d15dca653bb5d5056f1481eb42c43b46b8
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 functions as a link farm, with numerous embedded URLs pointing to external sites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=fraction+word+problems+worksheets+4th+grade PDF link annotation
    • https://amd-export.com/site/upload/file/21204918371.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fugokoziwisusupit.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/81ac347749cd87b084a6c4ccd9a7ca0a/85736295674.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/kijilutuv.pdfIn PDF document text
    • https://togeltop.net/contents/files/44403327890.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c12389f6---39522171608.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/gogirurelagexidipefunagix.pdfIn PDF document text
    • http://ijfbn.com/editor_up/dugudovomebogi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ebb8f574b8912d98e0fbd3fb829aed53/tajirewolatedi.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/24394854958.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/vinemi.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/34806798392.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/lifizeded.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ntbs40a349v5sq2s8n8rtjo840/rifupixisejugub.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d4f1a265e---sidodipafenanevuvom.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/doruximabigiwifi.pdfIn PDF document text
    • http://veitali.com/upload/files/6661881321.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/29381098692.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/rodeja.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/jenidevup.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc1e34c26f---nowozuxubajajowowuz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f56912d737e---geradirolizedaki.pdfIn PDF document text
    • https://arerp.kr/data/file///tefamodajoda.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/bifidiruxonapepumewimafi.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 16896 bytes
SHA-256: 7d9c2aef997cef0b6d8b73b7c21428feb4322f818a4fc30c12924425ecd2033d
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 11336 bytes
SHA-256: 021963e8d5c36ffa301922e4cde200548fb7bbd09d50c543955decc271717f8b
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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