Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fe623e24449cc5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 18:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcaf83104dcb7d09a30629e9e669b011 SHA-1: 7d9266e4a92d9d9c0d7a1b0445d797494934c8e6 SHA-256: 94fe623e24449cc58b6a72669a69f17daf11252ad652750e4d7eb4fdf42120e8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8afa968df88aff44dda58b795f5d78ee/55730580142.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/02141fb62d721b2292004b73be604740/wakeda.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/69189520198.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/1694648619.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b12fffffc5f880c8b83a91d56d96305d/29998090259.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079084515d57---51038447070.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/n69198e8prflln3jfa3mi8fta4/dudubokesewov.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd940f2898---12179107768.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9e8d4dd45248d93b9ef03ebc1e78c1d0/perovite.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/jusuzexefupuzenudiwuvove.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/fupemezijebulaxuda.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54336338925.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/burasir.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/nirumiwamivug.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3e50cae9---gedaxoxofovemaxopuzovozi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/eeb406bdb220eadb543fe4d87eefbd94/35212041834.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcec316da5---62662250940.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/44219625117.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094990b79349---fijaturulapukefo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/s5th17d65fei78pa8fenttbms1/kaxebi.pdfIn PDF document text
    • http://agrion.org/upload/fichier/vapawidudupe.pdfIn PDF document text
    • https://proxus.nl/file/wuxalisezexesi.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/40992326521.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/45253512744.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/gebitugenarik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+a+family+friend+write+a+letter+of+recommendationPDF 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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16752 bytes
SHA-256: 35744998c9fa11e87e908dc30b4bff7687e7ca8b53add3fa719a00f8ab5e962b
font_02_sfnt_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 10700 bytes
SHA-256: 774395b2ad84a1571a1d7d9df10a5f8c76cb7c55fe9684db32ebfa0f09fd6971