Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1cd9ba70a9fd83…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 08:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ece4a1709b710afe92820fc220a8135 SHA-1: 8baf59c0844a1d9bf2ebb856fc42bc962f6f2aa2 SHA-256: ec1cd9ba70a9fd83d31727c5fb5187c477def81556c10ed52377bb70053b54c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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.zochrot.org/ckfinder/userfiles/files/vikotagabapovo.pdf In PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/fomupifap.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108041248497631.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/kebuxok.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vemake.pdfIn PDF document text
    • http://accronline.com/userfiles/file/napalozexesi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/524d2343c8f365b26ddb2f7cb3ee6818/66231479135.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mdmns4qbs5baaqtn7v9cf11mq0/30704426683.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/71013013091.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/18884450996.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vaxupigis.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/68214650212.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/1888831800.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607365412a5fd---figisetupen.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e71d23cf18011908e4f580d9df887ec/94768459908.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/zaxejaduzirufonusavexid.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/loreviz.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/jazemanofogagizijeworutux.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ace40a916---zaxofofefewa.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/buzexe.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/an472dofscqgd129km9d0nqloj/jawufijipom.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/990ebf26fa20e681928e7bebc40c93ef/68151755717.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/73345952873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cerebellar+cognitive+affective+syndrome+pdfPDF 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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 17520 bytes
SHA-256: ec200de39610543149a158d551a73384e244863e0d17ca383927975bc459edce
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 11312 bytes
SHA-256: 3f7aa82fc621af2c0c7b4adc26d3e2ca04ea6fe3fc624b32a25352b5befd449d