Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3ff7a414f1223a…

MALICIOUS

PDF

108.5 KB Created: 2021-07-16 02:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aee07cded952d591fd65575b7988f73b SHA-1: f86bb861d64537977344826f19c4299013bffeeb SHA-256: db3ff7a414f1223aef111dc2a63079f37fd01be1692ca9d43eca6e5ffcd5a817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or hosted on disposable infrastructure. The primary purpose seems to be directing users to potentially malicious or phishing websites, as indicated by the embedded URLs and the 'link farm' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://chcial.ru/uplcv?utm_term=physician+student+loan+forgiveness PDF link annotation
    • http://rjbmachinery.com/d/files/45827734913.pdfIn PDF document text
    • http://ha-sine.com/d/files/binojet.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/53450804606.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7v7imsvj38k67epikmn9mc3o31/55929017594.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9d97f444---53738673446.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/folazunemenaxup.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d4980d07215a4283c944d81717e1a91e/58011122689.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0952ff6b---ratotidegetagisafav.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/85cc2de6693e4183c55b101b43e0ebdf/luzubal.pdfIn PDF document text
    • https://promise-land.com/upload/file/bapurofurisesirefe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f882774674579798e745a7da2a6d54d/29337150802.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77f26bb2e---negeb.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/pejajutalewulosare.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/rubejotekad.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/84444444693.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/80085362388.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd20743b2f---65001150035.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160956c275aad4---84849753370.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ul9ucs6c3v6hen3grq64krfntl/58257042296.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838379914a9---16196404042.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/138e3170a114fb0dfa71213ff0e524b8/runepesiwexulisevixox.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/51278370334.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_off0001460a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E21 11036 bytes
SHA-256: 9a082d5e9e45ccc7a27d89fabaa48d75265b15750820a6cc53ddcfa46684b609
font_02_sfnt_off000177a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A0 17324 bytes
SHA-256: f62743ea18e911ca15db4b362e9c466bd2aedc83902c7ca9d27aaac70faf2c56

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