Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ca24b4dca3f43e…

MALICIOUS

PDF

97.7 KB Created: 2021-08-23 15:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4952b5b96b915568f132b8da38e29c37 SHA-1: 7ef599d35601a13608439d9c1c12294ad9aa7a76 SHA-256: 61ca24b4dca3f43e9598ebb83acc16b278090f3ab7b798d64f4bacec8edd47f6
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports a malicious intent to direct users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=celebrities+without+teeth PDF link annotation
    • http://dental-forum.ru/userfiles/file/54375114721.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4d58613eaf7361b9919eb5118ca26520/69734607594.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pazuzumijizukefanukadevos.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1d0d09d1c0b2de2672394a02e2d81cbb/81304968268.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/rubiludupotitufagada.pdfIn PDF document text
    • http://hydrem.ru/images/file/88311228818.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/59277586354.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8c38075359787b1c4e70e3fa09291757/93659124193.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/54ba653db230ade59340280e7b3c62dd/gozawisuz.pdfIn PDF document text
    • https://synersys.fr/contenu/file/tusadojarup.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dufunidileroboziwogume.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/85881276170.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/af3a2710b7fcbf50fd98956caae2ba82/56701018006.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/24e20f3ee46994a336c7cb1fde590383/95970470973.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c832a7a869---tutulo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2cb4b164---59358875951.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/76381821237.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/kesumesokugebipudopupilo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5e8dfef12710e38a2b950c6573e9a5f1/36606435360.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0urrg6coeqmprkrt806l7mmj7k/ximetezeraz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2473853f24---21356797243.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10163815894.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/cpbmkocqahpjf7k9kecjj9foq5/wuxunuvetevekagotaf.pdfIn PDF document text
    • 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_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10296 bytes
SHA-256: d921c84394edf9860adf35dc953540acaf5f3805cf781644b561a77372ba44b5
font_01_sfnt_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 17932 bytes
SHA-256: f5ff5d423645579be2c396ae4eec71f8453adca4ac4c78678518ec9b9457c086
font_02_sfnt_off0001603a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1