Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53eef0fc846d4db…

MALICIOUS

PDF

88.6 KB Created: 2021-08-23 19:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff1749a20904e28b3cebf1840be4fbf8 SHA-1: b92f8c3690e5f39e13310a98450d976e43c5466a SHA-256: d53eef0fc846d4db21c8e4ed616dd2ba52e652c978f6101c73f0e83c70f4a6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted content. Although no scripts were directly extracted, the PDF structure and URL analysis suggest it functions as a link farm to facilitate malicious downloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://wietsevoermans.nl/ckfinder/userfiles/files/32736530503.pdf In PDF document text
    • http://jrmhandling.nl/upload/file/vefakorawub.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ff3f0552---rifavokabanitemu.pdfIn PDF document text
    • http://zzweien.com/d/files/tonotukepabe.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c18934e8d4f6fe37c1423fc1e83df00d/73788589581.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/o2liimtjn3il0cav9n6rcslrj1/39899086086.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/kitopotevedolobapobunone.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e03b2533b---waxifumuz.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/g6cpjm28stpre9p6lo2pbkqtlo/lipibadi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rgsne74qsuup62c0f7s78rgaqd/42166960397.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610c824e82350---21031722289.pdfIn PDF document text
    • http://myqself.com/upload/files/suzabumujifosezeju.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/jefixiraxubisike.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/dojolugi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611820e11acb1---tafujizimajewun.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5953224d1---jufunidadafiwa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160812a4ea31b7---89419798052.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/472882723.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b04vjvul44pfnu1t3h3mb6nhg2/joguw.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609229b30e747---tabozunerobulivuxaxemeze.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/58575537995.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/44647001952.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/d1doq2luq1oj6cnqg35h760um3/lupuzorifabukubera.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/maguwadetobave.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4520a5c0---xakugakefa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca729beda---45636030763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+harry+potter+movies+with+english+subtitlesPDF 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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 11348 bytes
SHA-256: 5b449e095dc43b6ac06f575dbc82583fc1d3fca81ceb556ac32623bff8ba37c1
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 17624 bytes
SHA-256: 2df9dfe9497953e3a8d511b1408f34f4d4f19258ad7f4d8cc8f3ff96bc122b1b

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