Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1c207cc8a64227…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ed816636b463ecf841b31561cd31aae SHA-1: 809444ce0bca1ab7ef2abb18e25e4d69fcafa317 SHA-256: ea1c207cc8a64227c9657edd88b6bc5693dd8c06b7091e4fad94303730393553
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=scooter+giveaway+2020 PDF link annotation
    • http://abwlanham.com/uploads/files/xudibudilezigo.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/25185718394.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/77959257678.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n0utptrl61uvb9gi814kqgrl13/sozisilolutumofawit.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/58940392913.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/kenibepipupovaguwakuvemi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/lonumonuwenanu.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/mobivewadal.pdfIn PDF document text
    • https://digireg.cn/upload/94088161962.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0bc9fcaa8f7021fb6528a978c6192b35/70142932835.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/708c5d37acc4b3efbf65134c6ef380d2/zosemigidadinotis.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/12643914529.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/95759510836.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/80996277334.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/dexoxalapi.pdfIn PDF document text
    • https://activepymes.com/pub/file/sozitefi.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/kinitam.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/degegujobef.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a423534e---livumokuruvemerukam.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/36156723331.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad0a1161ff---budufuzurugosenusazusu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/58081b7e45d8e7dafe0970129760f657/20673882043.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wiledosudajubiwa.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/66839480675.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb3cd80780---zaxag.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8r7brg01ler70cqrf22ko1inb6/gogileginidukax.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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 10672 bytes
SHA-256: 6a26c103e9025b822d2f00d49c92ab154ff896cff8718b6e51fdaf01542d251c
font_02_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 14268 bytes
SHA-256: aacad66e929474b5cf4938203840cad6e5357280e33050d9ac96fc85170c7848