Malicious PDF — malware analysis report

Static analysis result for SHA-256 734e2328400b90af…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 07:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42a9bd480814952b2a86c083a5ae6b41 SHA-1: 4e9e2bcf56c13516924092b74a86b2c33b034166 SHA-256: 734e2328400b90af5db2739e96cd77105644011215eb6480571c9606b9855cdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple heuristics indicating a link farm, including links to compromised WordPress uploads, strongly suggests malicious intent. The ClamAV detection and ML classifier further support this, pointing towards a phishing or malware distribution scheme. The document's structure and embedded content are consistent with attempts to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://hyundaidongdo3s.com/images/files/30159498546.pdf In PDF document text
    • http://yuilchem.com/userData/board/file/50377612495.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/71123919690.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/60691315895.pdfIn PDF document text
    • http://enkepharma.com/upload/files/67196255934.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/21982030722.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/tisobisisitemuporabavufar.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/71533218802.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/94182275705.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/64702075143.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wavenovomidikosif.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/83432416238.pdfIn PDF document text
    • https://triosms.com/userfiles/file/muxafajojapuvugifexob.pdfIn PDF document text
    • http://hangquangauto.com/files/45084522182.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/75033543221.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nukow.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/joxozafe.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/13519479923.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/zibimipejawemaw.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/8076437560.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/5528618131.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/82907972733.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc411d4b4---40884641851.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16146f8e07e8db---24861895452.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/95759344347.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f3ccde84db01eb03762e17cfc5b90483/wovoboluveladumad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=adjectives+beginning+with+b+to+describe+a+personPDF 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_off0000b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 15248 bytes
SHA-256: 974a51571d794f64c2c2e08c9b6a59e99bc5500f082959f2c3d6997a29802965
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 11152 bytes
SHA-256: ee7213cdf20787f5130731d33a43ad0652e97711df3159dd4f45259bebbca3f4

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