Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0d71163a0eb160…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 22:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bbfccd59cc1266703630529b2c4d250 SHA-1: f816df85979b791b40133ee8380c3597a07581c6 SHA-256: 1e0d71163a0eb1609d5db2fbfaf6fccf94fed1fe3399fefd7a2006ca7d0a9b44
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5954b4329a3a6be358b05b762d25fdec/90796272187.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/zepifipojotulu.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/60589218264.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zobavanuzitezuv.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/2ba62d.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/zamofufilurimob.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd56a390e---79512230000.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/24f9abfe9b190334a172ba28510d4f8a/kitebat.pdfIn PDF document text
    • http://www.andreapondika.cz/file/relaganewebugupuduzefok.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/sepedexexazubifovogudopa.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/27663258656.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/tojodamimazo.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/riramobus.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109041301062379.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/domisasepanevasomidege.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/60663403446.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/xobarexejolibi.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/31486617932.pdfIn PDF document text
    • http://baoveantam.info/upload/files/82656080662.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/30479196156.pdfIn PDF document text
    • http://belniig.by/public/file/63481567642.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/neforakivejetoj.pdfIn PDF document text
    • http://medrea.ru/upload/files/91041155785.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/23826080168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=decompile+unity+gamePDF 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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10664 bytes
SHA-256: 47adb21d0dc3cd6ef72c23c31e46fe0ec4b0cbd8a167f145bfd35a0f2797063c
font_02_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 18640 bytes
SHA-256: 69c745725d55038b0c552fa25bc2f5ff6bc7cf81c9474a323a279afe339014ac