Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6d9273633f946e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 22:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4539b050c0c0526d85d37b308ca3f01 SHA-1: ffb4ebab45ef992825abef5a0be948689b807f38 SHA-256: 1d6d9273633f946e7f8d6a411dac8f0f6cd46e6a6b0ded40d9e546b163610b6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malware or conduct phishing. The presence of external URIs and the overall structure align with a phishing or malware delivery scheme.

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://infrive.ru/uplcv?utm_term=qualitative+research+journal+pdf PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e09c462dd8---78385546334.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/kovupasarabig.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/rodewakuzeke.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/mimuler.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4364b777189b77de436c745fc8d5c9d0/powudizifomufijawan.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd6d5afa1b9fb8821da955fba8a96d5f/laminimapaxinewelupavuvu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gafasepevuvowar.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae8697771---58487777568.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cd37a07ea23ec9fb407ac3c6616a6346/81977206900.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/sigijevodatatuju.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/28298628545.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/25114016303.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/72782346349.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/25808050922.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/atrct317270q2dv19qre8jku4k/ripubux.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/2275646729.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f11bef02cd---29872271983.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/13e9f5a333afc3f91548cda06e4d9780/44700650863.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/mubiji.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/45359853222.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d0bfa1fd6---mimilulavumus.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/29361946925.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/bexasabemipig.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/tevul.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a0c45ada---941900804.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_off0000c0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BE 11072 bytes
SHA-256: d94526ee6c64f87d1360dd27cd684f5b8a0112f6185ed863753bd523c5084842
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 16116 bytes
SHA-256: 604f68374b8f84e0d548bc8fc15d826a6951318059eb863f5fa4eb94536b66a1

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