Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f4efef8c17f3ea…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c3e7021d4d60f62f8a2bebecf16e565 SHA-1: f8788e663c22ea0313d87abd3b7f9af5796ee5e5 SHA-256: 53f4efef8c17f3ea6ca6efbda189e6a70406f0116512ced254f3b9df27d6ef5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=largest+and+smallest+continent PDF link annotation
    • http://nurugelexport.com/ckfinder/userfiles/files/97847432111.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lojujodotuvamibugidivo.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/bemifomuwazutudabud.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/37696893113.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/45131199224.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/75776003704.pdfIn PDF document text
    • https://atlantidegattico.it/file/sevijubejazup.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/dgia87n9b4hspogrjvke3n5ugc/salisajufozemo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4ebkd530mlicmu301u0kkvk2v3/xejija.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/36201153468.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/27748886527.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/vedejeloritege.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tikejezeji.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/71294418489.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/xemekutuz.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/newiwofagi.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/11025417695.pdfIn PDF document text
    • https://el-tall.pl/pics/file/gevux.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/11728276709.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/petabisegazigusajev.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6cdf1b509---jarapawuloretokafakegosos.pdfIn PDF document text
    • http://spakimthi.com/upload/files/2732617643.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wufumepano.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614700e1bf776---xixijorukulutitafunefe.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/gilepuzudezuwimikudeku.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wokasadubifune.pdfIn PDF document text
    • 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_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 19212 bytes
SHA-256: a1330f8d8ce566758207931b206e31bab009d2f567e15ee2c9c1414c5baa9651
font_01_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E96 10672 bytes
SHA-256: 53db42ac0e00a2155282251af9183d9c76654ed7de41d766ed0b1d1157efa7f2

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