Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1775dc95756ec47…

MALICIOUS

PDF

112.0 KB Created: 2021-08-15 22:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 08a02641bffd4a62ff4a7a4b6ae3542a SHA-1: d46b7b4146491033881aa3772049e16cfb8dad4b SHA-256: f1775dc95756ec473d7a11f7ac62b124123ed8f4fb122b52c82e5bd1c0de455d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/80583opq1bleoq544cshtan1m8/bomaxabavodemubasi.pdf In PDF document text
    • http://ufnk.fr/app/webroot/files/file/34852740918.pdfIn PDF document text
    • http://zae.me/datafiles/file/zeguniwer.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb10c6bd1a9fb2e6b009d79cafa95995/65420799868.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/wavagi.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/givebo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4fogrhc8n3vjd5svcblmpbnqp5/kagigumated.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db964074a20---12212959092.pdfIn PDF document text
    • http://edelstar-mos.ru/files/rapuxilalonomasivavetufo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078fabc72f39---mejobarewoxogejip.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68b3a087e---32814415877.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/piwelux.pdfIn PDF document text
    • https://onelineservice.it/file/76268149225.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9ud4m10aah8atqo2gibef1dcl4/62550243956.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/6b76599ddf052955210bde6b44b4a0e0/40681168732.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/29cf1544968976abb32c87f04be6c366/xabubikajuvaroji.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/betopagadanegukazuf.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff75257ce---63825293970.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1e78303b---fopigutaponab.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7620e60661c8de60512a692429a5576/zonujakowe.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/fawagutevejis.pdfIn PDF document text
    • http://it-hair.com/userfiles/nirabefetulebetuguxu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c4f97724c489eedb5c9e5b07716e45f3/nosir.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608116e9a215e---90368588501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cartas+de+amor+de+grandes+hombres+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00013c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2F 3016 bytes
SHA-256: 8e37c3568664fdaf261f4d96827b85e998c5c6a16a940afe7e9b029eb2b1c2a8
font_02_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A1 21532 bytes
SHA-256: 13f24e04824d2a3164b427157de58d5f0ac64352dfbc3684b5b1361466547f16
font_04_sfnt_off0001979b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1979B 10976 bytes
SHA-256: 623cfbb2440a13777c659871ecef2a2bd0810416032f4b851391fc09590d39d9

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