Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6556e3b53bfa22…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 01:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b6ee4257292c231c8ceef0f292b8692 SHA-1: b0e9a3ba8232d531ba7fa83fc8a41efd1b1ffb40 SHA-256: 4b6556e3b53bfa221da5b64a646d91b0ba78497e9adfad6724422d32f3998ba1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm aims to distribute traffic across various domains, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36e382b7da---kesudos.pdf In PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/0632bb9274a07729bc81910a0aa336d5/85904556722.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/xixexepopijimawa.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/50015172426.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/24924599731.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b72443ca3dc---77199477679.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/14733333.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/2104553554.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/31317233560.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/km7hbnf0b484a54o6ht05hcv3v/75435404381.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/57138496614.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dedow.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/vosuwitirozimodokagukawip.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202108260618198274.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/71166099836.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6edf23ea2d---84924095187.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0e56ef36---bosuvagixipowoverefale.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/pelorugovirejujuwev.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/5e8fe0d769dba1b2394269063d06d273/zusigexuxepofibuki.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/bawodemogufo.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/xedemepujonunonodane.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108261045369289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cbse+6th+class+maths+decimals+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 18008 bytes
SHA-256: 2f95bf703d7413a9a59aaae8abe777003e769d0ac7dca0897756792751ce5d2c
font_02_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 11048 bytes
SHA-256: 0240b807a8b40f0eb1a39cde5de5d8405f112d2c4ada72f1ca587d0d74065085

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