Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98b36f8f136b0fe…

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 09:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2be0d922655c2afbe35ea68dbb84412 SHA-1: 8f651df8188beab5fb3ebcffd63efb120cba404c SHA-256: d98b36f8f136b0fee493abc1a19d9d6cc69a7fc60b7b33c219786ca6ebc0310c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an intent to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nikolabartakova.cz/files/file/84836028547.pdf In PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-20/20210820063326419620.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/92538813750.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/da8d151b9a412ae9287e989a157b5e86/84346769032.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/jijafilotilitarezesusanal.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/97202894011.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/64349167269.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/qg0gbl5rkt0p377pevg09e5mk4/45545866261.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/16221558300.pdfIn PDF document text
    • http://elitvorota.ru/f/file/62446043206.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/80606137726.pdfIn PDF document text
    • http://grupophi.es/uploads/files/wepipur.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/27778344699.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/48564023516.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7qppplocrbh7bug6hpmv95md4n/85684077346.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092335376e09---nedifaji.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd118f3abfa---wekezewolewekaxuvuv.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210828223056_bghzb9.pdfIn PDF document text
    • http://megalaserasia.com/upload///4004358443.pdfIn PDF document text
    • http://rnralpha.cz/res/file/51972946724.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/94317057363.pdfIn PDF document text
    • https://kermanrooz.com/img/files/45091658826.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8d9981a05---zatovuzofulatimenar.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/91101975889.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c388f9bdd7---kadulifomaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manual+de+kinesiologia+estructural+pdf+descargarPDF 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_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 23036 bytes
SHA-256: ab3127e4cb45e9a7260de7652eef0750d4971457fa803c24e4c7aa5e347bbc63
font_02_sfnt_off00016148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16148 10980 bytes
SHA-256: 63cb79f9fd9c2ebc9d54ea5fe83fcf6f45b4157c270fd5a0d4a9345058e1a79e

Open this report in the interactive analyzer, or submit your own file for analysis.