Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3ee6376f23926d…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 07:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdfb7d84a9d12414a7199081eb6be911 SHA-1: 39401ac3bad03263bd4cd53273280573a588af00 SHA-256: 9a3ee6376f23926d4a53fce76529ee6fa5ec8c6dde5a75bf37b05883654c9d5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=historia+de+los+sistemas+operativos+hasta+la+actualidad PDF link annotation
    • https://rpdev.org/ckfinder/userfiles/files/vukoju.pdfIn PDF document text
    • http://zuche0551.com/upload/file/63781962439.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/7560566865.pdfIn PDF document text
    • http://nature-revive.org/files/file/32924498742.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/29120004370.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776c231864---fowinib.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8aa75211---64435387060.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/supujaser.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210817233732168.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/bafik.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/39863198081.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/70888024439.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c70c6c2533c---52035861450.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/22346967962.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07a4d3110---99934552112.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/96423b08b747d3f74fc2f66e610db648/wajifo.pdfIn PDF document text
    • https://emmaushuis.org/pages/49895329306.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/97633568485.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcce4ae32---9021734753.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210703174842011.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/58156707354.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/13253274440.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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 17332 bytes
SHA-256: 80fa66f5568a25631f32210705e3ab9d3a0af856e272e7fa4b61ec48095047d6
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 10832 bytes
SHA-256: 842a19cc6c6c10e5fb11d86fbc72bc118b134b448284e66ea56b093e15e1d267

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