Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffb9d82bbcbaea4…

MALICIOUS

PDF

142.4 KB Created: 2021-08-14 22:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 198ed913a0a20893dd326b8ba689a2e5 SHA-1: 167007b57316f4570e5a987d476da4736ecf671a SHA-256: 2ffb9d82bbcbaea426093e61391d55b6e280d37f082b73116984c9a79b666d45
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm on disposable hosting. These links are likely used to redirect the user to malicious sites for phishing or malware delivery. No scripts were extracted from this sample, but the presence of numerous external links suggests an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chrmglobal.com/userfiles/file/30492916470.pdf In PDF document text
    • http://brandiassociati.it/userfiles/file/tuposafetegezala.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad42f301da1---detatajifetodeparavu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pijona.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b3faeaa9---80605708311.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c523e93437---pugaduma.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/basamibotujiwulaw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863abac5631---54605795570.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f4f66fda---jerivizorutilovijokebaxi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b9f2c5d683---pejozukelulumuvijatebap.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a351541b1f5---vatawafisu.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/venijififuxux.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uhl3g2aimjl9olt016pg1a3a65/32575713886.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/japotagugepapelabi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/28458430460.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xokefibizaborara.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c70c2c0b7---sugaliguzaguzurugamo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/mipitalezebitikujedolid.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/23995986731.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8582c48abac324488153f587155a33bc/wapalafolukikakixodot.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fe5deffc---93022511399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cuentos+cortos+de+terror+para+ni%C3%B1os+de+primaria+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_off0001c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C92C 17892 bytes
SHA-256: 2ed019d3724b83eda05d5d423a91c692cb9c1fb5e0214e7c306d2a8eb723ebe6
font_01_sfnt_off0001f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E9B 11072 bytes
SHA-256: ea1fab738dde89276d76566c8d245437f4daa83e1412a0f0a9a1c3e133fae50b

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