Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f79d4b9d2a608c9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 02:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b509d2df44910cd362bf653f8d0c78d SHA-1: 7cd0e1bf4b7dc110ed3ec70f4a2dd967f62db519 SHA-256: 0f79d4b9d2a608c95a5ce3b49e7aee6a5e614ba4e94fe496cbf30ef63d1eab6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer. The URLs are designed to trick users into downloading further malicious content, likely malware, under the guise of a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=download+do+jogo+gta+para+android PDF link annotation
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/85800434246.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/fapul.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/piropagigowexi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pizunuj.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/90213514516.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/59464837351.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/48f61fef43a58ad34bb24a1c0b75e88c/fikirorizukefofulesax.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/15088790919.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25be42567---80083511311.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141739a88d58---64526605435.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/bumojijeg.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/21048846055.pdfIn PDF document text
    • http://foodchemsino.com/d/files/bonimujofav.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/7253248476.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/63701768257.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/gatidoselowetonovot.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/71205386813.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/59610194598.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/woreminipemagexikesewuna.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/17119211878.pdfIn PDF document text
    • http://kd-council.com/upfile/files/fiselizoxi.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xogijekefovesupoko.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 10484 bytes
SHA-256: 90a7ae521f1dd55b332fafdd10b79dc03084126ca97c96f2abf0f643c16e1715
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 19580 bytes
SHA-256: 6211dc0eb062b1387f0217aaf654d7f6eba869306614b54164794747686688f1
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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