Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4afc6269f66a26…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 00:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2937ceb44e583545b67a12cd91a5c7b SHA-1: f383359b76deeda530c2e95c677409ced600bbc8 SHA-256: 2d4afc6269f66a26559ec46c1d92818c4717bfa69937bdc461ab5f235f7ae167
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier strongly indicates maliciousness, and the presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious content. The document itself does not contain readable text, but its structure and the heuristics indicate it's designed to lure users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/0b3fc8905d82600fb9019889d3535d87/wupobefexufifivuvek.pdf In PDF document text
    • http://pronobile.de/catalog/file/75302117559.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/ruluxaziraxiwujexewifib.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34a80b5901---94770341581.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/994c75f2bb57b3cdc1617423bbd2852b/38264692350.pdfIn PDF document text
    • http://candientushinko.com/images/file/65273818453.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160804144323fe---jusiwifikamosagojizusa.pdfPDF link annotation
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04a82084c---nirekifu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4b788ac6---vajexerixesibasani.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/11622643492.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/bevaterijafeji.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/worisudifusuxolan.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/89c1f4d21f6eb220f8f66668f290f227/90004777536.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd1d8d5f4---35276950540.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/59325127509.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dh8ju1hviho4r4lpg8rkntt19t/57871294971.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/39251752874.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc9489af9---50073324006.pdfIn PDF document text
    • https://philcoastal.com/ckfinder/userfiles/files/64135499930.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/xuruxawikefagejamojusus.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc459eae727---47673428895.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1a804544---84257979951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=i+wish+you+shelter+from+the+stormPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10464 bytes
SHA-256: ea1e00563afa3bc8e8527c99f57d3adf91ce44407a46d24d8ea34f56fcd18d40
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 18364 bytes
SHA-256: 39cee55da3e38f2882e3f1ab0b3fe701d9a3f520e9bceb2796e130bc5ca23fdd

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