Malicious PDF — malware analysis report

Static analysis result for SHA-256 4590d83a05f82d97…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 16:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00c4e1b0ba62540cc97e85e535333f1e SHA-1: d5d8ea1dda39b85a84db5620bc552a8058dc0efe SHA-256: 4590d83a05f82d9727984e578aff1e6d1d606ab9c425633468834fa13d7b7592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are identified as disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://marbletreasures.com/uploads/image/files/70306754631.pdf In PDF document text
    • http://szwygs.com/upload/59376655452.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210926180831654.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gujoxevezan.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/57560988384.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/80492012492.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/zofisemibax.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d67f25252---56290809372.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/lakabe.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/fokimedebawone.pdfIn PDF document text
    • http://mlead.net/images/e/file/wupufejezuribawijutabuva.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/91557103097.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/dubazefufuwefijufiw.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/57097988129.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/36h81v87qhus3vkdknipjmspgr/xinaporovadazobu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/93718448916.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/lomenurefukikatema.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/murajovepesalutidagujinej.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bikawuwazivus.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bcd12bacc2b52c63b256c5e07346a06e/zejoneposukusina.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/50547805976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wrong+turn+2+full+movie+free+downloadPDF 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_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 10892 bytes
SHA-256: bffca67b563bf0f57598fa7a66c3097f51214822d1fa7db3d1fe98e23211f564
font_01_sfnt_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16884 bytes
SHA-256: c35a2b86bdf673f66e63655bce11f69f1369ec5f8f8d3242ef7616cf451f5743
font_02_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1