Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67de2a8d4c3ddab…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 00:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d36e1ce0277ee9760414b83efe35b53 SHA-1: 74d48c81372653d2ed20b18364885522817aa4f1 SHA-256: a67de2a8d4c3ddaba8a8b2bff7855815f9ac9a1a2ec8849d6303834d3f12641c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cdff1a20c---rotadutofekofem.pdf In PDF document text
    • http://kawoka.com/userfiles/file/pijixetakabelekun.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6bc0cac13c57d4ff205f0703d340459f/82451524860.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/addf172ec67e8f92663651485cdb1863/41618033916.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9e7d48a1---fepejudi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/22711398836.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/21/file/20210521_160500_103.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/gotefabinalemezavituluga.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/jojegobiguviv.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/5603432406.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae1aedef6---12636697588.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/jirexelotixivero.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ig7vrbp6qbjvkr20vo11kami25/lavofigoso.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/narulotupu.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/72148958970.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jekafakovepiwij.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713b1b8f15e---99723246251.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a05dd581157ea79264c2286b120701ec/zefiwasobenumeso.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b0375f2312effd29510b4074b48eb444/tuwisijasevuturolaxuwu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cc178d0a050c53e81cea28e3b38fafa8/15553356829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=predictions+about+the+future+worksheetPDF 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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 16416 bytes
SHA-256: 41365994f0a2926521cc5cad4521afca17804812ad6d8adb66f60ac775b854cf
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10944 bytes
SHA-256: d704ea94979b55f128237c20f76c942c7b9626bf598f2ff1bccc23a22af4ed3d
font_02_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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