Malicious PDF — malware analysis report

Static analysis result for SHA-256 332e125d63b939a4…

MALICIOUS

PDF

68.4 KB Created: 2021-09-12 22:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 286fd69dff6fcc831950522613ae9088 SHA-1: c63bad88cb20a1ddd0bb61da771e64f0f8373523 SHA-256: 332e125d63b939a495156637808ebb7cb5f430e80768c1c3b6b2fe06fc634e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133492351abf---tisijulolasudodazomuwago.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c6dda217bf213cc0a741beebd40aa233/rinibarot.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/dotodikamevifozurikige.pdfIn PDF document text
    • http://greenbrier101.com/userimages/xudirezatolefo.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/betawonawokefe.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jatosogodexaz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/masuburi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613255e42e079---nifizazusagitaxojorowoles.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/jaxezikujotoneviro.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a8b8lhh8vhkvlst32n0gsireiu/genezuwejipoxikovumobetip.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/96765121271.pdfIn PDF document text
    • http://mp-journal.com/media/file/ligoxuzedupewarorop.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5194e4f---45283041821.pdfIn PDF document text
    • https://windscrm.net/files/file/wumirisu.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/gofuravavitanivisuz.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901190108587142.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/dedupafiw.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/wobakotezakiw.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/lofixebomoribuvonixug.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/4043607510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=geetha+saram+in+tamil+words+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_off0000ad65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD65 15016 bytes
SHA-256: bdda149ef7b13b8e1c709bc8cbd6b2003f1b657df1101b56f61587be6c807f86
font_01_sfnt_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 10888 bytes
SHA-256: a3bc418fdfb4304ae6446685f8a6ea2bd7bb449f66a26765f0df5cafc868a627
font_02_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1