Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f8ac92b0f5947a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 09:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5817c55b0e681045dfae4f80e3ac6bb7 SHA-1: 9eff25e0be4c3fa394fe650ca434c7251d545fd3 SHA-256: d1f8ac92b0f5947a08b09595bb34a1a744cb52fc17e2cd601ef584df1acb4866
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=invasive+group+a+strep PDF link annotation
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jaferamoxakatekujafadu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/85518567384.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hhveupllodb59a7av5onkodqb3/47899213413.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/eb8c61b07301fac0149d01df67da4c02/85612684306.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed6bab17bd---91705889643.pdfPDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85671761080.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/32644240788.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fdkfiuutamuit5qek55uuqg941/74859714894.pdfIn PDF document text
    • http://iphysiology.ru/upload/roriz.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/19710538342.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/30073345059.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/18273411669.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/8828565930.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/dezidaxatogikor.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/fuxivumufapux.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119b5025a923---xoxufediwojejivujiborate.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/59767531033.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/22b95e15a18bb2338fcef5be7e252675/dixiwivubelabu.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/mamixedonejerusurivo.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fct5fqckotnf1ahnks3ns2n2g3/fiduwebidevudavu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/k31289be0opl412jeotjhb4rdr/1293316946.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cf990c7fb---nenutisedixubigirevuno.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e78a9e22---28076731654.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_off0000c6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B6 17360 bytes
SHA-256: 5cfb712e5ccf923b74aa38745eb8b52dbac4c7d2956200ada9f058d26bc4141a
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10496 bytes
SHA-256: 9b9c83e157b2de6792d4b606ac747e10c72c0c307a277c63f6db4c42abb82772
font_02_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1