Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b23c59d38c2cc47…

MALICIOUS

PDF

97.1 KB Created: 2021-07-17 21:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bcbeb95a0c2314a58b326747658c052 SHA-1: 973449580ac1d12d81fe70ddb0255d4071686e8e SHA-256: 9b23c59d38c2cc47c53b7f75c57c9c1d2b853c589766d9bcd7ebc971b253609e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01889cf52---wiberutifumamuwepadewavi.pdf In PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210620095232.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/rirasazenudibopinijel.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7df40be638758ed16224aa5b8a4ba631/84450223834.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f9eef09c---72204440958.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gutukaxirukukunavof.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/43999760070.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/soxujifixutel.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/sazedegofirawibojibobo.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/kuvulod.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/38124196251.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5296403d98bf5098eb5579aedba90e11/3472566444.pdfIn PDF document text
    • https://koratspring.com/upload/file/dovezutadu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb51d963a---wotajopanuj.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/44108607233.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xapixixowupamijepapizap.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/gaviguju.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/karokodadoruzalapex.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fn1tunssf4s13f1qvgq65dk244/18740642164.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/fqa0e57felucbqfb306hggsdk0/69559044086.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/33baa071c459dcfba3f85075d4d99c7e/nikovumofesomorize.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8503a441b21d70da672bd1ad4698fca8/xupofotetekesiwobadibo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608195ab403d1---zomubigadinizikok.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/neguta.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i543vmi2lldo1mtg3vnficajvu/pavoripaxamipajiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+fundamental+unit+of+life+class+9+notes+pdf+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_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 11104 bytes
SHA-256: bfc1ae3c1e74efdd0364d50a44dffa4d71c6eac26bb30700ceb9b5fa228d93d4
font_01_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14999 17164 bytes
SHA-256: 3ce03941b2362653d919d259dc5aba56092465f10005deedcf174f1d806c5419