Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba888fc41d54d3e…

MALICIOUS

PDF

90.7 KB Created: 2021-07-30 21:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3f79312fd450cd6b280e51820a3b7aa3 SHA-1: 72d3a5329ddc1b43108adfb03b6661ae0f4af231 SHA-256: fba888fc41d54d3ed9e3ef1129c994665423d2f5bd15ebc16a36084056492e2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=sujet+eco+droit+bts+sio+2018+corrig%C3%A9 PDF link annotation
    • http://immobilieninvestors.de/userfiles/file/60541083404.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/791353fbbc5553a0af4e336ba1ea72a2/89354492291.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/79369881635.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/vuvajokubi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b989156d44---powenerogepokenetumibo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9a0cc4da---70902403689.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/974452805.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/tilunipiwikuz.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vaduzigumavu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a59f0594e3b7e710f19eb3e15151d035/1749577930.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea5306341---67255434500.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/61271780775.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e945c5f36---24815152236.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d762a3f7---naxuvuxajebetif.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00334f6917881b7c6054e9921e6001d6/76603435805.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36a811d85---98658167984.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f39cabfe9---mejedif.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jidafov.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/70720199601.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d6b8fbc2---nokekiwabidu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da8202604---tujefi.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/83714807575.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/67022877639.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b188945231c---birewugizewalunitewiso.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_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 18296 bytes
SHA-256: 0313a0492760cf75ddb3c0cff791889df7954992078ec6457b24beae9e816aae
font_01_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 11336 bytes
SHA-256: 2fd283f506451c5ea2f16104d8028137cf90b1450e49cbcfad829e5ed94e0c24
font_02_sfnt_off0001423e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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