Malicious PDF — malware analysis report

Static analysis result for SHA-256 162c7d509d3fdf59…

MALICIOUS

PDF

80.0 KB Created: 2021-10-06 19:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9fba56fcfd8f904729b813dd62abd9d SHA-1: 3c97bfcf35b59d4392d9b7c6a3e5ca1f4d93295b SHA-256: 162c7d509d3fdf59cd3093a42acbd8d8b4de5d9f963a0502adbb2a18ebbd5761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://marupyara.com/fotos/userfiles/file/58026267005.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5b968ee010a73154556dd0ee7c4a59c0/62962211689.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/46586271135.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/32559208515.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/6313783906.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/73423746861.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161507a85018b7---75946164024.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/31601139989.pdfIn PDF document text
    • http://www.agot.pl/upload/file/63343889166.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/68554016228.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ca2492d3048711d4d3ff297227a1d031/toxonujigifez.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/sorufixutezup.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93089123649.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wizefajeteduzone.pdfIn PDF document text
    • http://holzweiss.at/12123297212.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/ribadag.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/84094181633.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/soravitapal.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/58138421853.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/70174279777.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/59bd72e5fe3d69a0eab495ea36a4f84e/dejedifejaxovomimegimiwip.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/60669389815.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/1971467099.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-2/20210902054957406920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=normal+cholesterol+levels+for+adultsPDF 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_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 18104 bytes
SHA-256: 07701b7a393d309b0eb159c62caaf13943c5991510cb14da3ca1ab9c3281480e
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 10688 bytes
SHA-256: 991689e01e8a6301bf4cc561c884c6348a0d83544a774e3e7b8ffebbb6cbf7ab