Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba04c8c32147b7ef…

MALICIOUS

PDF

86.8 KB Created: 2021-09-24 11:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fbb0f5a0e12df737fe1658f9f05ebda SHA-1: c51284b0a43415e791ccef08dfd6688afa17e651 SHA-256: ba04c8c32147b7ef5c65e1773e7ad999b256a9842523a1c60ebbda50725b87c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://agencement-menuiserie-var.fr/stockages/files/71136489865.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a3c4231d4---tapigobovesidun.pdfIn PDF document text
    • http://4rrecycle.com/files/file/68340446926.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/xikadinujetum.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/zuganif.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/3261822623.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/viravupagosupube.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901112539147694dm27esjs0r7f.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/tomonobax.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/74369004147.pdfIn PDF document text
    • http://elsped.hu/files/file/momejerimewiz.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0507080268d4a93a9e2e74c76f7417dc/26220113684.pdfIn PDF document text
    • http://talesma.com/E/file/dosudojonezite.pdfIn PDF document text
    • http://apsons.eu/files/file/padageverunofubevi.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/87759356794.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/fimalovifijexu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zirubusesikulus.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1086d974654618f3347eb91995785d44/99570980006.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb69baff78---lexofofo.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kirabemogamezoge.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/sigalume.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671ebe00f2---93697029636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+ball+z+episode+59PDF 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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 22084 bytes
SHA-256: 9544fc2b431419b1f8bad80f83ac4943d83d0ef10691c8f13c3ce5ec3cf8777c
font_01_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 10972 bytes
SHA-256: 9b0b30ec31c9884af313adef461449f3d3508e39f2e377c0578b45253ab6abbd

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