Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4292ce351918c7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 20:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b92ae0dfcafa36ee64716f204ce9b3c0 SHA-1: 5c9877154d244c573a05747192327b522de1eb8e SHA-256: 8d4292ce351918c7e5552cb600759642047eec8dcbe8f1c9a4ebc9b707a29454
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm pointing to compromised websites, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many hosted on WordPress sites with form upload plugins, suggest a coordinated effort to distribute malicious content. The file's structure and the nature of the linked URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/98c8460e51a0d764fc4a26b255cd8fc1/vubexi.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/fefavelamipojeladi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0c0d48d5d7f0ea0edb572e79386c982e/sidovomuroguzujuxewodi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rseq8qu7e27m07pt0k4r8gm2b6/mukowolugijopegemip.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d4e12b1ec08879a5da015dd09b47fe42/93029292825.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608439ae26956---gafagu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i58763tqsbdstcvrdlgmidtpdb/41867361923.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/42256507185.pdfIn PDF document text
    • http://bjallstar.com/upload/file/5901968541.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/17481413437.pdfIn PDF document text
    • http://hak-al.com/resimler/files/80293202443.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c30586g9rqgk0rj1dbiiib5fs8/47280117689.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/luzosijulelu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/56ec02dd01e94bc1ca4ce45a97c02999/noxawusabogavun.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69446e0a0---bosugas.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vemitujekavid.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/depoxewilumadodazejudet.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/begokelapipamuzufinuxizo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda092ac02---82954297717.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/aj7158pdmvpgm84qmdgobtuhmd/bekosowozuwetev.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/54448492289.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0b5bc58f0b09f2510b041f073cdccf32/11283683811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+handling+certificate+lastPDF 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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 10728 bytes
SHA-256: 7ff02f52079a82015b38e6556c169b746ec866e54d0e5ca6446e71f44eaae4fd
font_02_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 17436 bytes
SHA-256: 075636834c6d2087c6c0cdbc7228f0bfbc38a7f7f00f533cdf9f30dda3371f14

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