Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6773ba9eec1581f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 20:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f626d73ce5fd8739b8ac095daa93df64 SHA-1: df6eee5e0f307a6fc695b689c6218db280d3bb13 SHA-256: e6773ba9eec1581fa827656ea8b6b0e9caf708454ed04dd37bedeb790e042048
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URI heuristics and link farm indicators points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=alarm+controls+ts-2t+manual PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984f7cea634---83730572907.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/jopivereraw.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611258f5ae04b---78502089981.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/melusazopuxoketexolinenof.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/34663254929.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/niwutifibaduvemepodotubat.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f315c5933b0d82f57d482afc496aab73/zulovote.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e8283a9e9885b950f2549c857fa5ca4e/64390884678.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/db7ddab20d7f6508f7213559a90bbb50/ranumevudon.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f57ee0bc---115068445.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/ludusinegovin.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/80140316813.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/juvefededinevu.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/44794394541.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7effb24e75a707acf47b0e25b769cc30/36390550565.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/pumidimiv.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3cgrsnjrbccfgbuu8qlgqj4vf7/62635791560.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/gubax.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/pamisaganabuxupum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816d1f2874b---55122278092.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/56bf8e5a3e0b6934d30d8dabe1d6fe82/47605066602.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-2/20210802100817510931.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/95839273759.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/76661329749.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc6b40fd4---jufopodujimaxejo.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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 17728 bytes
SHA-256: ff9eff2740e5e1ddc53fda4a82487299dc8497fd470fea165f858c40a0acd2b0
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 10400 bytes
SHA-256: cf5343a638aa4cf5a6d2d207ef80bf294904fb23fd8ce87ae1d520a6885a199b
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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