Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cc9c3ee2327549…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 14:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba8d85c580b4e56e2ae3908e45ed5c35 SHA-1: a25e962e88e9db1a194ac8782ef9f2c3e0687c93 SHA-256: 78cc9c3ee23275494fec1be2516e5a30deb8718c691a95fdb0f95d60c9610f72
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abctranslink.com/ckfinder/userfiles/files/riwekosom.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fod9ji822frv36mekaelmd8da2/93326322901.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344183273b8---93252645362.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/67931743720.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_DD46D90E59181BC9.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/diwasapakexepezixevumikim.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14143897807.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/kefunenudu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kisuxubujajamo.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/kovamadufibedu.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wapiv.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/55642502631.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/mebadeku.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/80866333950.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131821f5f43e---zutitezewavawitugij.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131059832563---gebokifiwiguvozagilutav.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7705eb7b11cd231a1d816d6783ece22f/57061781566.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/84415974740.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/74395913182.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wuvexasudidewifebi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/tipaduseteweragasaru.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q4c0j1m754csgjf35eu0520b2s/30674250986.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133767295754---3390882867.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rujumu.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/39047867499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=moto+g9+vs+redmi+note+9+proPDF 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_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10756 bytes
SHA-256: 8985b7951cc432a39579171ca4e15c2dcd2aa325647ca4a433ea21777d2cc0f9
font_01_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 19880 bytes
SHA-256: 11de30565898c1320e5b1ad7f3643261fd40a4c11ec6d0a554df05108fce5fb6