Malicious PDF — malware analysis report

Static analysis result for SHA-256 df70f81a56dfa5f3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 12:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2cab2ace6f7482c29aa5ccf22d3d450 SHA-1: 50c20c3721604e324e0688075463c89820a763fb SHA-256: df70f81a56dfa5f32e37d8ba5a0ac9f74f9f4afd5e9789aa3f71ce0dc39b6cf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to download further malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://neoneofytou.com/ckfinder/userfiles/files/84274504914.pdf In PDF document text
    • http://casier-a-bouteilles.com/file/xuminizugew.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/vusopojinida.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/tovozozew.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/71931056069.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/92419314428.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/22491988218.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613517054e81d---52645446328.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/52357826012.pdfIn PDF document text
    • http://wami.cc/data/files/rewedugowuveboxipemid.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/bemenoxafarusekam.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/29128091182.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0a45499847f87c42beb6214f9b49f8c8/2168664699.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfe27205f---76423908019.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/52199160820.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130436c8e228---jodezopimawemupotejak.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kblh8amad0hu3qvi323jb88og6/tirubopebugekoxake.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f74b94f39843dd23b95356bcd85eb0cc/8427222183.pdfIn PDF document text
    • https://losungversorger.com/product/file/vuworujufiwosetotofav.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gibusukob.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/bef62f583e7dee105ca736f4a0067fbd/zerawivevejawebe.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631541289.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/wenosu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/xotumitupik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+the+good+witch+movie+2008+online+freePDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 11352 bytes
SHA-256: 8d18e10decc80f4ab04e4e8b3a8673f06629afcd379a2c445d378fe8738b2bdc
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 17372 bytes
SHA-256: 3c75806f3e309f1eee6544f4f695df3a54bd2ef0c93ceea6c44682703e1020a4