Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfd2259ea1a8f5e…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5616b62ba47b31d14740d531d4328fff SHA-1: 164753329b38113bd125ac474bfba1c9bda42bec SHA-256: bcfd2259ea1a8f5eba6db49f90a400cf80a8b3bc67dfca51ccd0652ed661ae8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608451d092550.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa91fc29f1c046618832d36150d393e5/52254201887.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/kawaxofimitutik.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210704_69AE657D93A26C34.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/zokadaka.pdfIn PDF document text
    • https://ancoraeducacion.com/images/turibolat.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9c8fd8424078aebf9afb7628a6f8b773/10927134160.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd404e9ec8---78651260684.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/02fa004713c7c84841ab2c8d1e9bd152/1218286917.pdfIn PDF document text
    • http://tw-jia.com/uploads//files/202108100700316803.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ps1jtqce7t2vkt7j8i5m9fjnle/88025946721.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad757cd59---88944065631.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/51481826501.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/luduzilirerolefafawa.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/59490190085.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/52072921050.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/nofivejiwedubo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fezokunoxuzazaxidud.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2f692ff2ab7722d85b5139976dfd0d03/34310928551.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/43384670156.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/21847940051.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rcdcjdvlfp25q84ssmgdiomcft/tumelixa.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920a386021---50427676047.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0j4n50lc5lnn9bjgrhctlvokj2/riwosidagesojiviza.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/5147116062.pdfIn PDF document text
    • https://noddy.nu/images/file/60529037244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=map+of+world+continents+pdfPDF 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_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10692 bytes
SHA-256: 30720c52e972e9782ab01634198eb5ae263a9cb8ed5380a445443145c4fb8c14
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 19184 bytes
SHA-256: 9fd19b3a2c548efcbb161a53dac1507069b0da62980d529063d275687c447d58
font_02_sfnt_off00014365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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