Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac08a482d901c06…

MALICIOUS

PDF

82.0 KB Created: 2021-10-14 16:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c7fee9fb2effc1da1f4065f3046b6db SHA-1: 413dac90d90939dd106ce27e9cfb9dfec7dbd75c SHA-256: fac08a482d901c06c68bd20615290c136bc54f14beb6a071b678d35415bc8921
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and URL distribution align with techniques used for initial access via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fourfoods.com/images/files/24051982368.pdf In PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210926_8A6FE8BE06739963.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/fopenowoniza.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/mikuledijuwak.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167ba1645b52---wawafusebu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c29fe5eb0---4797347450.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/junuxajaxeturoro.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/23846403478.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/roxixobabavudufojitojedel.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/65283068849.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109182012262319.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8b4489591750443561ef9f7557260b58/67440534203.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20211002211522.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f6c29fc91f6ba1e06cb56a29be33f58a/26265868009.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/54432953866.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/54573030879.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/50231957610.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tovarupatefuxad.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/93049910980.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c44aa88456---buvulovadore.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9cdaa8ca9---23250719689.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/natiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=relationship+between+education+and+society+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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 18328 bytes
SHA-256: 39155ae213bef07410f6eac7e8b70809392faa03d60b602c9397a1001aeaef69
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 11104 bytes
SHA-256: ee6490499c8e1683ddd13480035de7fc0a8f91d952e13d784ef831fa4553d40f
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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