Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bebe1d23b09fd4…

MALICIOUS

PDF

73.2 KB Created: 2021-06-13 06:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 07423515b00cd7339dd9cecb87409885 SHA-1: c8e5916fcc1ec270b1589475aa47d3b96ca2cf83 SHA-256: 82bebe1d23b09fd4754469e1f19ade8eb80352217d6b5ab255338d23611ca5cf
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=boruto+senki+3+free+download PDF link annotation
    • http://shannonlakeestates.org/fck_images/file/soxizatogulopiregirene.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b275a5422d2e1299e2efdaa6252bc6a8/wasesixojegemovefamusoma.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gffg5b6mtidj46mmcmh63b4ild/25488834879.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/48537485235.pdfIn PDF document text
    • https://tavio.ru/files/file/renaleviworalaniguv.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/i3p4fhien6gguv2lfmq4nvrq52/5576611632.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6cd8ab112---ropuxadibejutinura.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41edec857c---dinaboromanafokokogu.pdfIn PDF document text
    • https://bem-sa.com/img/file/nukukajepekik.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/pivobewabot.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/xexaxurulebafuzomagurem.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/10100052668.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/vesopigirasuvunixe.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210518215349.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8acd4f44c8752f073d544cee58a40cbf/fofodadenukodima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e1c0abee---33169310091.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 5268 bytes
SHA-256: 35568c07a0c9eeba08d29d55436b23cb0bd1b353c9c12b2d24268246ccebcb0d
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10980 bytes
SHA-256: 081a27714e980f3b70aea7de7c01d45a9ffe0bd70c3e52d2cb5f41312a554b39

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