Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f283b8d04a8fa8…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4558e800f5ebb4c5ee18e8ca09d5ac4e SHA-1: 2a3f3ddef41d1acdcbef270c1a3793ee19323606 SHA-256: 11f283b8d04a8fa8f631d8b4e3335993dac5d8ecdd27299a8f192e211999d41b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a link farm with multiple URLs pointing to various domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jager-ig.tw/up_photo/file/78760318476.pdf In PDF document text
    • http://e68momo.com/shopadmin/upload/files/25455057645.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/273m65iml2huefa7t8pa5cqspl/72231821079.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-07/images/files/jorazakisapas.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210913/file/16314910987194.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/81339546187.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/vuzikipakuvuvutizujexome.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/93560792588.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312a7939d7f---diral.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/kikunuw.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/mojazagumebep.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/posokikadixonemili.pdfIn PDF document text
    • http://novafish.it/userfiles/files/36886177615.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2e77fd24---3958127119.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090810003961.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/fidodorefek.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/115da88a5ea316e8b24b42315c75e8af/bufusa.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/zevimazevaxaxoxodonil.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/77342310350.pdfIn PDF document text
    • http://www.tvmreza.tv/ckfinder/userfiles/files/zotijavazafanejor.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/sevexoxiluvup.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/76179701222.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/43183347876.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/55154756837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+ghi+%C3%A2m+cu%E1%BB%99c+g%E1%BB%8Di+cho+android+t%E1%BB%91t+nh%E1%BA%A5tPDF 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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 11884 bytes
SHA-256: d3b01277f5f30ce17a07857cf1122e3d6842e4daed7e2c7306c6e9d94064dd89
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 30196 bytes
SHA-256: 5a70eea55ad6d1901c97f6a8f2f8bcd5387a97f82f341c0879ea0af18dd515f9
font_02_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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