Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a7d46fba829e31…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 08:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a89d7714baf9f3d5b3dcfb8d67aa196f SHA-1: f4dd10e818e9febce5dc092f4351e6558e7c6027 SHA-256: 81a7d46fba829e31f64f1ff80d637de977fc66f841881d75548e7676231f4fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URIs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=microeconomics+pdf+class+11+cbse PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f1f39da---13623792324.pdfIn PDF document text
    • https://blokhol.com/upload/files/dolorafaloxadekepaxumo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/87000498963.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b001be8d442030e65e379244409616af/robilifakonijojuda.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b760d3978---levogagibesizevanew.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620781745.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/65481563988.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839b377fbd9---vadinubopupalofe.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/jukonefidudiwexo.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/wenijor.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bf440229---fasukofasupinemi.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/27730061484.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7jf08ss91pm2vcglm2427ok6aa/rumufepafetimowabizari.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb582678fb---wukumikunovoxewul.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/kogisusefewak.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094c763d6ea5---jivexinubonepede.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bexunedusakapenekafofod.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4b244da288b848f68665eeda58545cf3/29902802058.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1abf2bdfbd162eec86cae17624c7a66c/9204362812.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee6f7b541---33874317456.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5fd76678---ruworajigidawajodupaz.pdfIn PDF document text
    • http://bienbao.org/uploads/files/16615043101.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9d2b8e86---xuwozajinaparemafu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a11aac7cf0f---zobarovasozipomilofifezim.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/pobizokobapuvesikewife.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_off0000b87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87D 14784 bytes
SHA-256: 525bd4132bf883c5222d0ac835cf6ad9637e5b9058583974bdabffb85fbe9c87
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 10868 bytes
SHA-256: d3cc58f4a4c9cf31e3514fd36025aa946287390646fe33e9b08a9cb6ce060b78
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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