Malicious PDF — malware analysis report

Static analysis result for SHA-256 130bd53d2cab50f9…

MALICIOUS

PDF

76.6 KB Created: 2021-08-26 17:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70aebe3b9dbbf6751888d2999885cc2e SHA-1: ad48464bfa840518baf3f531d1750ca5ed2b5f05 SHA-256: 130bd53d2cab50f99fd40e5a6ccbbef8f3da80126b5278b3d49aa90e7351e500
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous PDF files, some hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://equantumconsulting.com/files/files/pubitaxuferenakomike.pdf In PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/fevoxuvasebosaba.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/nobegurikifodobulad.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pujijuxarobuzo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/11aacf63207bac9582ec5dc3f3d27b22/44400427009.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/56491381894.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/83419115290.pdfIn PDF document text
    • https://trips-in.com/ckupload/files/68444819555.pdfIn PDF document text
    • http://charivne.info/images/file/9009284923.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ee8c2b86---24427880178.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gb8n5eo8v2k8nm573nhtpvdcl2/vigenuzakiraka.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/507c7619eae8723149c477df7496c918/jizezuratumuwesebi.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/31947591538.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/dakodovarubapojobabafapep.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/xoridubakelibigis.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e4a20e52a---71706869137.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d87e91fb3---wovefexitobufasiw.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/16512535172.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/97982602520.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/91ffdc29b97c6dd87ca3d6743ba954bd/kikoloj.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2d88a1184---5264451688.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/47571808913.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/8267769664.pdfIn PDF document text
    • http://gabortech.com/admin/file/sijizupuros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+overwhelming+never+ending+reckless+love+of+godPDF 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_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 16964 bytes
SHA-256: 874c4eb5c63cb9ad1f8834c2bbdf67f50aca042abb6d8d3a269f12e6c040766a
font_02_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 10868 bytes
SHA-256: 0687a4e10068924bc88be1c5adfd6f79b19d44f4b1a6e0af131ec42b1597730d