Malicious PDF — malware analysis report

Static analysis result for SHA-256 063b45ec39776a56…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 15:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 117cf5a4156f08d87f25578b5ebf01f2 SHA-1: d1689964c1049306d20913bc9e2c330b3a44799e SHA-256: 063b45ec39776a568f20001098e98bdb02a5f69c6344329a362c974009fc595c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

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://pixomot.ru/uplcv?utm_term=worms+android+bluetooth+multiplayer PDF link annotation
    • http://dailyxedayhang.com/userfiles/files/jagepisinuzetulo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300d4e76682---69525968413.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xifomesages.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/9520880733.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/teo75dcnhl2bjsd6t5a6ii7coa/3615873579.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/1238817307.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/02697f91b1fd5a3f07b6ca9befc64fc6/80175810030.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/98278104019.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/83163259860.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/jetosapu.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/83549082064.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081429136011.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/70158399452.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210906190731.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/wibotekibudo.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/tibapiruganorofezuz.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/16475144898.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/47038598755.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/86245313156.pdfIn PDF document text
    • http://agro-partner.com/Image/files/26070309541.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/mezelegobutiromulujagoza.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_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 17772 bytes
SHA-256: 0a4ee79799c395fe63d825eed6d06b6cb6953019e122f60083b75cf25bdaac13
font_02_sfnt_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 11004 bytes
SHA-256: 4dc52eb4c5fc769690dedffb6b095d0a02fccb7613c2746e2ec5195595577541