Malicious PDF — malware analysis report

Static analysis result for SHA-256 efffdd7f986612d6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 12:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73c8983f516329a1b3db3002c17bd3e1 SHA-1: 722f61567865f92d5ac24a210d475f231e7f1800 SHA-256: efffdd7f986612d62ae321757ea8989d549e3cccb2fc4f903f149fe59898491c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to various URLs that host further PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=play+store+install+app+free+download PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1sj9ook83haqd856k1ccp813r/mebaxav.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/sikufapekusi.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/9130693269.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/17141479387.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/93195680249.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/73267115793.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/65363849235.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/42336769959.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/45319844983.pdfIn PDF document text
    • http://scsychem.com/upload/files/8819679647.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/6638365920.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/luvasifosirulerab.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/27897165616.pdfIn PDF document text
    • http://vswet.ru/f/14835776195.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/25218300755.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/mefororulaz.pdfIn PDF document text
    • http://gekon.net/userfiles/file/54670367461.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/8751418371.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kebagusemo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a806beccb---31864886392.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/9971041283.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rajumajoguzazu.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/44735338232.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/90512512903.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/98654677607.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1330784a---41058566641.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/misumina.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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 16784 bytes
SHA-256: a202ea5eb15869fb7eed3415856d1d6625d19bcc33ccc8b757445415c3fb6b45
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 10692 bytes
SHA-256: b95bfb592c01c84c7ce13543a50cb187318d919e207a7c5c86ce79c0f99bb4a4

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