Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f68ad3e791990f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 02:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f13c14177369cee473415a4a46328d29 SHA-1: 4f9f3440190489feb91e2ddd914e258e5a297dff SHA-256: 08f68ad3e791990f11049be71ded023e0bb6fb04c592825d4971b688c8d6b5a6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. This pattern suggests an attempt to distribute malware or conduct phishing operations by leveraging numerous redirectors.

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 http://elite-nails.pl/Upload/file/91177441887.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n39602nia1oo0r2tgcbit2qfhv/12137418484.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/xidivi.pdfIn PDF document text
    • https://autopratichesas.it/file/somogipejidutu.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/rawebixakejuwuzobuja.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8f851b0c6423f80ee3b44619ed777a9f/dudabexes.pdfIn PDF document text
    • http://dentherapia.hu/files/file/50595484977.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d052d76a3be---vowopivutefujadej.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/63260632061.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f19b45eec62080307eb8d7dd4a9c5ea/2160502842.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/soniguwikoduvozuwu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/juwazimizovisixifijitas.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/47455598185.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tenamajumenetow.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430020439530331.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609733089486c---26370987417.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/jomow.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/71210498422.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/32072753753.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4cb8642872f18b0417a82348ea02fb7a/61594355348.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ea272cb3---38635164816.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/71309760657.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/us4ntslj4hi7kdisqdagipntvg/76457514666.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37ec3da21f7c0edbf60bb1f36472c146/20575735993.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=powerpoint+themes+free+download+2019PDF 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 16944 bytes
SHA-256: d18c6584dc86d554f4dc33d74e4dbc77aeaaa51d7c634aefdd4b77a4013610e2
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 11312 bytes
SHA-256: 08c107d1d81f0d8364664cad65f994aca425da6b66e37c9f83d378439c02f42d