Malicious PDF — malware analysis report

Static analysis result for SHA-256 5721f0b46df98f73…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 01:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 904b9811b975537300175615a06471e3 SHA-1: e9c31febfe881d18b3e7237d01f847968b30eb32 SHA-256: 5721f0b46df98f734bdb22d68a020393b3cc6ed18c80505f90bdc01c3138d67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to phishing or malicious content. The heuristics indicate the PDF is structured as a link farm, with a specific heuristic flagging it as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=pdf+editable+software+free+download PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5k62glksllhn48jvsn737kgae3/53230296244.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d37ebb7de2---muguxekifuwogowomotito.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/tolobep.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zabirute.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/68477281933.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cqdni7dla2di83afqrntmm9vk2/segafomesodukavofazali.pdfIn PDF document text
    • http://edgecs.net/documents/xodanewopavubefijagawe.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/149jbh3p9hn014jiel3naugur0/26071993383.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fc8d7f4bf5912fea2fb5274cc8ec787f/runojelevapupov.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1610adb896ed31---raligufufovabugugof.pdfIn PDF document text
    • https://f-kcc.jp/user_data/userfiles/files/varuropego.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/binoru.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8c5b78fb---pebibebuxerupumexovofuxad.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/16653320924.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/79515454206.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/gonevowigekoburezibija.pdfIn PDF document text
    • https://unosms.us/userfiles/file/topefapa.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/e0bff06d42ba5f4c0bc2798554772cb5/wugusadezomusi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/niwoxo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd3e18866---73000684405.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/67050705871.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1be4f2fee---tudazogakow.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/75544400977.pdfIn PDF document text
    • http://greenld.com/userfiles/gosutojabadofiwonopewavin.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c8aaa2b5c64027e617d617630ae1d4c4/tugokek.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_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 18592 bytes
SHA-256: 178130fa5e30a76d9763c50e561e9d9c56c77cc031bc039fae3f3188237d0e83
font_01_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 10576 bytes
SHA-256: 8194a17c8992a422d4e53b3d8bef911c9a0e4d2e53655ea46babc90fb44bacce

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