Malicious PDF — malware analysis report

Static analysis result for SHA-256 543b4a3aae65572a…

MALICIOUS

PDF

87.5 KB Created: 2021-08-18 22:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b76a209c613d70c60918d4de948e738 SHA-1: 1a0d8c8c2439522b22654c982f6d116bbed0159b SHA-256: 543b4a3aae65572ac2b077bec4f02091aa9ba68904ef34ac9613329526ff72a3
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 multiple compromised WordPress sites hosting further malicious PDF files. The presence of numerous external URIs and link farms suggests an attempt to distribute malware or phish for credentials through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/115b0c545cbc43399e563c70fb6700f6/vurolofixiroju.pdf In PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/kepifita.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc71acf60---92398764310.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/3119129519.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16071df20c91ed---nulejikaxubomixoxudo.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/93371276746.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071741fb3214---24118433866.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111cb518ddc7---73557127512.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8c3d48afb2e38dda7faf4ece393c5e89/10923567224.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/88889007740.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ada8286c---bogosifakufe.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/17468365158.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2472db05f4---jenidolunekugabesowub.pdfIn PDF document text
    • http://planetamama.ru/files/file/1660262371.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cff8a152545cc1e833cf9ad9b01e5845/pulitumipiwinuxezotoj.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wufekixunar.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/42250321847.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4a6af9f6969f55fea24d4364d8058001/tawuxomuwoferekow.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/wutizadevuno.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/92603481325.pdfIn PDF document text
    • http://abc-tel.ru/data/File/lejerejenesamaperipavufu.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/72994879893.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/52101989300.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279a4cdb53---13269733453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=guia+de+exorcismo+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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 18460 bytes
SHA-256: 8bf76af590874f23eec2b28fe9ee09da0eb7db559c212864ca6cdd22c74b27ec
font_01_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 10776 bytes
SHA-256: fd697756ba2ce28279ee2897ae7275b02b634ea4e55a8914b365a60ebea23fc2