Malicious PDF — malware analysis report

Static analysis result for SHA-256 1891dc5e5aa9638e…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 15:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ffc5ed24e802893071cf59e8863e816c SHA-1: ae192e538df7dcf3e608e32d0393510269806543 SHA-256: 1891dc5e5aa9638e6890fea2cd5533554c0f345f3879f27b21b939bb5a303f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09f24a7c4---92092705558.pdf In PDF document text
    • http://keramann.ru/uploads/files/pududifiwexidigujedoxodep.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/95773705107.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/32209276235.pdfIn PDF document text
    • https://tavio.ru/files/file/8567972230.pdfIn PDF document text
    • https://ip-pharma.net/data/files/napumigureda.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/ruzopabugibipuxekivoru.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/wamopiruweruj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94f1e18403---50987027863.pdfIn PDF document text
    • http://ux-school.ru/files/files/jibavexikivaw.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/92743545133.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/28031959332.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd7f0fed2---butemugofalavowuvikexared.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/bitoji.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f175ea9a6c---dular.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/61764958959.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a60ba6cbf282e5e5db877b71f6eff74b/33003853346.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b93cdbbd3b4e9f81510e7f3ddc411cd5/89306589182.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/81186362478.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/16912962501.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/575822155851620907328.pdfIn PDF document text
    • http://mebco.ru/images/file/wuramusox.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/73402503829.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/85821804709.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210609085320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=islam+on+serving+humanity+pdfPDF link annotation
    • 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_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 11176 bytes
SHA-256: d9ed682b5ffbfce6c46e74573a8e5d6d8df57d7dde51fe02f7032d9abd9981f0
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 19052 bytes
SHA-256: cff2304a292e285fbddf8081a6b87c8251a2123b671c2fde1239d737de17ed8f
font_02_sfnt_off0001468d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1