Malicious PDF — malware analysis report

Static analysis result for SHA-256 769e022a6dd7903a…

MALICIOUS

PDF

80.3 KB Created: 2021-08-14 19:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6e52dc6f0d28fb62df7c5f0eeabb7bef SHA-1: 5256bf57cbf1720a24c16aa1514c4a1bd98efc3c SHA-256: 769e022a6dd7903a0becccfdb555a10b00f67cd36c626fbdb9b8c9a8ba244444
116 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 installations. These links appear to be part of a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/74fq3kmkdo83q4td8sslvedpdc/gelasokejo.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe69290d1---gunojobilupemud.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lozogusozinojefexokelaf.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xaravitemorilax.pdfIn PDF document text
    • http://imi.vc/upload/files/vapasopinasalerenikup.pdfIn PDF document text
    • http://flirdining.com/uploads/files/52585862067.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105170102479243.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2pblmd4sb2vej8kirkb7amjhh1/2689164665.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f4c5e72a7---80371713512.pdfPDF link annotation
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/sitiwiduwuvarurulomowik.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d696211e---panitiko.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/melewezafarawede.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/11a3d3ddbcf5e08c5f973ddb5e4c4543/jasaj.pdfIn PDF document text
    • http://dejede.com/userfiles/file/saporaponozukifup.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/17744135980.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f8e838274bb2ff61876e9dd38b169d06/kuman.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/siparinobosebagofozu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6afd44ed5---41046496326.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/lurobonaviziguderuwak.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/gulujojamataj.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/vajovamasaluzuzuwaw.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/panoxivulebalugen.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7c13cd17aa701edae79cf5384431d984/86891668203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=advocate+aurora+health+email+formatPDF 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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 10616 bytes
SHA-256: 250c2180ae63bd29d111564232da3c7c91d4becda267a4d1d2d2cb24baf3bc9e
font_01_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 17236 bytes
SHA-256: b945f59a0eed4af18dbef22f45726a803fe5fd49e3bcf0bc10bb90c7fe8a69fb
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1