Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcacef4053407de…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 15:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 949938d4418435bc7be9646696f04161 SHA-1: ee29d54b95897e25e95cc0ef49f87937de9f2699 SHA-256: 3dcacef4053407dedca4b4dba4c1a9776ae3cf72575f3c51e5bc7124f526300a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pianoinprimopianofestival.com/uploads/file/28016432728.pdf In PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/52156170715.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/4696763053.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/93250787505.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/getipugotisiwejolu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131af97dde70---zafekirapune.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zimuwelape.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/16733447118.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/sagene.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/7772678467.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/senodewizigataxewa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161406d2c871c2---jogososedek.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91108399599.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/64882120312.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-09/images/files/gumugazodegusafap.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/20457619221.pdfIn PDF document text
    • http://accronline.com/userfiles/file/64490518234.pdfIn PDF document text
    • http://carszana.com/image/upload/File/falafubo.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/ginatikumoz.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/vuzox.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/36249b0cf44906c374dc79f8d24bb9f3/fejukazatuza.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/ruwuxupage.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/76072117827.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b79a5550---73157928359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=canon+in+d+free+sheet+music+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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 10972 bytes
SHA-256: df19cdd2f7f6950c488e556fe5c926ff5014f5216ca1157a986d87f0c089cbd8
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 17044 bytes
SHA-256: 7e0169f1e92e7442a9dc6a1ba4a03c4115d6662b1f33dbee4f0feb38fefce4f1

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