Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d5061bc2ba4ac9…

MALICIOUS

PDF

86.0 KB Created: 2021-10-05 09:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a749d25548f88e12fe7470b5a683dffe SHA-1: da9fba13d0309645526f0a218c027ca3dc17561a SHA-256: 88d5061bc2ba4ac9c0974783d65b3ff21fc14c5b4e5a2aaf6c1ab1c5dfd87a63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing Formcraft or Super Forms plugins. These links are likely intended to lure users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161526f0cefa45---besawevokun.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613058e4d2d28---50128145325.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/kovojopuzutovinogodi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc3e574e1eb64c76ff5cc9ad47992bea/29417269629.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/xivapiwufijaririma.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/zipusonaxetibes.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/94780abb827a1c034e6d4482d0f43270/88685845124.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/85527032625.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaac72a1f5---zodezidadafozenuromireri.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/74551135021.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5ffba5ff---jigonejunafoxaburuzix.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135866cadcb6---wumijikipazeranilav.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76777ec9---pozixaxanevovaragudunaxit.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202110021719523250.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9d8bdd0---falenibawifi.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/4567684309.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916050039.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613938238003c---25713121266.pdfIn PDF document text
    • http://videlec.be/ressource/file/zuninevuma.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/58032005390.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/kafoziwixonafep.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rezirimafakivoxowakorufu.pdfIn PDF document text
    • https://1ar.sa/userfiles/file/pemoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+lady+in+white+colin+campbell+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_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 10920 bytes
SHA-256: db6ecaf563b05636457b0ec26ace0d5052da67e5d26b359630e628d75cf55830
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 18652 bytes
SHA-256: a5bcd0ace00f3f0838d3152a46439230baaf44557b10e802dd9a23543114ee73
font_02_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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