Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37b694a09d83ae4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 00:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6deac660656f54654fd337069ab61a3e SHA-1: 22ed60288bfbecf137e635dcbf8285cf039f1980 SHA-256: f37b694a09d83ae4c39c2835ac5341910779e31f4dad829c40167cd460851e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely used as a lure, potentially for phishing or to facilitate the download of a second-stage payload via the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://insolite.lu/img/userfiles/files/61226559818.pdf In PDF document text
    • https://sce.tw/uploads/files/60f9b6946a30d.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bl77ai0t2uedd80a6s82pmt60t/12012934421.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/41779ae7a31d96330205f7125663e348/38982908826.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161000db74bbac---nozefedozegeranofilepa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/823d031290918195902fb05a05892e04/96630151234.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/rawakabajad.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/af66455cc25d8f5affa94813be4b4b9b/noxemiwabodif.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/nopidekuxebabibegezada.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/fojunaxitotogitotarivipep.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/mefirenefasakagito.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/21334246282.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161171156a40fd---25874216242.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqqacfigecmbdq8mlkdtel3g24/goxadexo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/retatesupisetewenibefif.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/pevutubusebin.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11804584721.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/nalugowig.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57a3c7828---karazododuvuped.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082687c4057d---66960014287.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3d523fdbbb8cb216c0773f2f32aa2a0d/69912984659.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/93575943047.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5d9d03b165ac063a83c196e343b9ed82/42729281225.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/wotokinusaxunepeni.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2e432e9c0755111431102a57c19cb626/42841366975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=motivating+students+to+learn+english+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_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 16464 bytes
SHA-256: f839066602e13a88dda8a0a35730e04f5e438ed675bfaf234893de4c300d76e1
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 10936 bytes
SHA-256: 2058f4d97bd9c16f24205070de975c952a94a71018181f5fca7b2b7140acaf1b
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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