Malicious PDF — malware analysis report

Static analysis result for SHA-256 774bbd6bb2349db1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 08:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 052dcfa0f54c9f514b08976ec1af4b57 SHA-1: 5febebeb9c5f43f82b48703d29fc2c03de6c6617 SHA-256: 774bbd6bb2349db104f7a094e7134217309f68fb2ff90e2391bc4876c3096b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, redirecting users to various compromised websites and potentially disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=8+pool+game+hack PDF link annotation
    • http://terezszilvia.com/images/uploaded/file/mevinapefegatanisogupusu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4c94234e23fd6606697ae2959d75c000/gafufidinumuwavozu.pdfIn PDF document text
    • http://sergeybazarov.ru/file/7551893985.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/wudibetenewebokig.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/79533814899.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/80015779.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/vavumoxita.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/mudubujaxujolusoxani.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/bixijuko.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/babd6c9c435aefdd2c4dfba80bdec581/fafofufizezixo.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zuvazovagav.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/26303468919.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2ce7f78a---58571353048.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/vetubev.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/20074605731.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a4d10c0f---20235338261.pdfIn PDF document text
    • http://hiniceshine.com/upload/15327588592.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/kuforenimow.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49588739448.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/xabak.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/sudesuzewurid.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fo0bovh7ob57454q6i6vp6ru7t/dabakalejivi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/17942277625.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/komidavizivito.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/43598463614.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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 17588 bytes
SHA-256: e6f201d0f8278035e91d34f37d5e918ed157c69932812ff2c04f91bea613d6e1
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 10460 bytes
SHA-256: a86d542ce5553c47cd4d6c3e0a5123bb9994a03e7223039f18d90c795033d7f4

Open this report in the interactive analyzer, or submit your own file for analysis.