Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb2fb612a4bf5f4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 15:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0eb826bbf23d233d89d1ad745231164 SHA-1: 9db787ac0a6bff64bb9c21fadb120a0a08fcce09 SHA-256: 4cb2fb612a4bf5f4ab17a556a1b0e9cd6b3a8ba29cc3713b3d414d9d9561c2a4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to host further malicious content or phishing pages. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://khambenhxahoi115.com/images/files/31774288918.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/28c156a6199a54f0ce27342ba8e39964/puwubezefuru.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosuf.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/73392435542.pdfIn PDF document text
    • http://chromavials.com/d/files/rilodezif.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/jukadelagunotinapituw.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/wakuvazuxo.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59299012049.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/22902459836.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/32125954184.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/litizexali.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/jevuridibetonakud.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/togafufudamaz.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090710514373499.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89b8ebd7---detokegibe.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/mitexomikuwuzobosido.pdfIn PDF document text
    • http://519pf.com/userfiles/files/depaxabubufokovonujewif.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1b28095e74eb6a6b4df484ab53afc836/lepabafo.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/29824089171.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/patuvigifesonotonax.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/gifivonusorevisino.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zaporagibatevovusiwofoz.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/nopidusesedivimavuvoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+new+imei+number+for+androidPDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 17668 bytes
SHA-256: 3f3dd0e5d13fbef430844014efc4c7e3425b83945bfc501b039d9c1984a12e17
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 10800 bytes
SHA-256: c7d8ba03c50234b07ae738b7ba94024ea0fd371065de38d06ff35f602ed53b33