Malicious PDF — malware analysis report

Static analysis result for SHA-256 d518332aecc0955e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 02:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cdce94be759d106eabe7f8f7a6a4daf SHA-1: 0da1c283107104373ac4af28abae0ddd2025808b SHA-256: d518332aecc0955ebfb36d5626b764ff135cfcbe3d671979b9f78bd457dfd75c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were directly extracted, the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://domilot.com/uploader/files/nexuwowelabowani.pdf In PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/94137832306.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/vovoda.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/mawufaluwizuruseb.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/85e9493168dcad2b3ce8f56c9c1a8e27/kibuwatekinanoverikas.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/21843720044.pdfIn PDF document text
    • http://standdominica.org/files/files/wovenam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e7a2e4c3---kazakeganefipofamekefibit.pdfIn PDF document text
    • https://orrizon.ru/images/file/vikazuzisizeziwagok.pdfIn PDF document text
    • http://4yoga.by/pics/files/budarilorofewovuwot.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/97fa71238d0face81f0433c8be712eb5/farurugabazebudinoxajol.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/levajosololapulokexezetu.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/biwanada.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/nixusosurerisujemerasafow.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/bipalarojev.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/69334171359.pdfIn PDF document text
    • https://12tiga.com/contents/files/2937220782.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fosimuxukejuvefizesur.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/sanapuwozexenale.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/basakimubemeso.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/gulepadesofum.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/farumanumiladotaruvo.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xekiguzifuxurulexopad.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/50710553643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=new+super+mario+bros+psp+downloadPDF 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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 10756 bytes
SHA-256: 98e21703cc4e92b93d09cc1c60bb94807ae84a882318360a1697c433676a2dcc
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 17592 bytes
SHA-256: 6f9ce5b3fa80eb0e03a0cf3acb7acc94abc0942000d273ddbede0443c5f65609
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1