Malicious PDF — malware analysis report

Static analysis result for SHA-256 8506052a2ba32fd0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 19:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55782ff549731d7bf9c94dfbf2a3f1ce SHA-1: 8902326cec6f22fce9ec890105617f80f6e6d762 SHA-256: 8506052a2ba32fd0227e0a38f0a0a71b90bf9598f0a8bf67e2c2fb4015e05a12
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to manipulate search engine results or lead users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a044f492eef---xufor.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b8fbc656ea97eb2b4de8bc314914c9c8/65764853913.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/10315282234.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/texisowerumuburovitili.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/momovudovawijobuduvokes.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/50648864970.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/pokosijinugetezur.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kijijiramobupudazagoxu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/posibunedad.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/2126262944.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7f6b92170b46e35ea6b8dc27e032f0a7/72923030182.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8549db1ca91a09665b5987b7883cf5f5/darowajiwuridekenaw.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/38060580663.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/20538617680.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2db8f5949f---wezuzevepi.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/85683546311.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/78177317643.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcd593d70---32872040835.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/74588611883.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/zilejoxederiroboto.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/wobidu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a8ecffdf36b1b900533688590fd6780c/6074693478.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i5718g88llh7lj6c7egqq3ke71/xutameba.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d26gcc45a43tpgb00tt2cb2nr7/jagasudegaxanipapuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=into+thin+air+pdf+epubPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866dad2d592---fifufosorapotoka.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://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_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 10572 bytes
SHA-256: 26804ab5fc00285578d36e326419a25ae4705e1f9a5d00687c973dafbd39242c
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 17580 bytes
SHA-256: 30d97a19f09743ac0ede5c6947ffaee309c03e787b9cbda6af9a9f3750ca1048