Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c7adef6b0c76ca…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 01:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 472c65f8420ca62d27a7876d225d120f SHA-1: 06e544e00d2542ce726a0d6de28223bef1394ce8 SHA-256: a9c7adef6b0c76ca12acd490da1df6b152b6ac482d239c7caf934cd869e2c348
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://cokhilegia.com/upload/files/mexetojupobaludusizadinad.pdf In PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/tanazuvezepekuxujesazel.pdfIn PDF document text
    • https://datajournonepal.org/files/22816742295.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150a481a1a1e---xumiduwuzogisefizaku.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/tilixewezu.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/gajasigupogemowafowivarow.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e38aa0e899c973d2407d5e09ded7f2a0/28508370596.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/mopetibu.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/8992004751.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e918631861b1195f5373bfda4bd3a0e/gotuforumad.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/vojanipa.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/75367557798.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/36825399758.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/31826727698.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134894fa01e1---moxisikuruziwariwowugik.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/17727470726.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/25328918575.pdfIn PDF document text
    • http://apothepharma.com/upload/files/romuvepusafu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b284e49db4---8944838989.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/darum.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/mufisakojujezovoxigimisob.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rr56di0rlgdod7i9oj976b2idc/79877613695.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/4901270733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mp4+downloader+pcPDF 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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 14848 bytes
SHA-256: 3e1cb77c6507676d68ece2e3d05d4865b47e0bce3838ecc921891e1ec4c928d5
font_01_sfnt_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 10308 bytes
SHA-256: ac4e98c2a17701e0946c922af8b4725c323894531ead2e24275eda5692c0f19e