Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6a1de8af9a137f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 17:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78d592b09b413f10b63d7c2987461206 SHA-1: d20d3c486397706353ec129ad2709adc13896b76 SHA-256: ae6a1de8af9a137f9081ac5329e0ba45a63b1d21998cd0f7adca4b626967ba20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users, potentially leading to credential harvesting or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://aokunoil.com/ckfinder/userfiles/files/97867436660.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c695e0141ba---75841991346.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/25653113208.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb9c92b2c---53949723173.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a72f6756f8c894a24743008438743175/duguzemadin.pdfIn PDF document text
    • http://3asoft.vn/img/files/xuxesome.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31037641348.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fe39bdc8b8264e3fa3033beeaaa2bdd9/81120622967.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/12573669828.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/wozedotexeti.pdfIn PDF document text
    • https://webmenuplus.com/images/file/88448299216.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/tadawojibanobufaluk.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/45901733472.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/tikenuxig.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/42536405080.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/b64dbf1d9073643c2e588b1bb49c9570/54315415380.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/21599641336.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/tadifodajadoge.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/48119730875.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1ut02nbgm2dus2e5qklsjqq4hj/tuvozixanodasoxawuvab.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b8c3064b1---80691023464.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a0c592c515e8f93c442302d7a3062be9/gaduriweminilomogafod.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4873109ab4---bovenadufigipope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=prevalensi+cerebral+palsy+di+indonesia+pdfPDF link annotation
    • 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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10836 bytes
SHA-256: 5be178a906464b03c2f796c8bb9ad22e956133328a86b11799ad52d5b6a421bd
font_02_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16716 bytes
SHA-256: 49aab90222f99309aa3a17efb8d0dadb5f855cba19ac65a8615e2780197198f0

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