Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ca5f664789039…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 18:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 312fcd01a12182b72b5467873ff126fc SHA-1: b8d1b5f3e372c510a3fe6679194bcb269a34291e SHA-256: 991ca5f6647890397bf032b9d64c1bbdd2d0eb8ea1b1416f1cd20bdc4f5b83fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate a pattern of SEO-based link farming designed to lure users to potentially harmful content. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f5957c1d---bezuginosagifo.pdf
    • http://dietetyka-24.pl/images/files/295986530.pdf
    • https://fertilizerproductionprocess.com/d/files/17187616083.pdf
    • http://krakow4you.pl/krakow/files/32565810166.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614517a9a21ee---17243866422.pdf
    • https://regionalhealthprogramsww.com/images/file/95601586254.pdf
    • https://marathonroller.com/userfiles/files/mesezedubaxi.pdf
    • http://websurin.net/UserFiles/File/90426944407.pdf
    • http://alituncer.net/userfiles/file/pijudipamotitipenodomun.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/23232ca7db21f3996283fc40eca9990d/22819160733.pdf
    • http://status-go.net/gfx/userfiles/files/maremarorupigaruloruje.pdf
    • http://krukaiart.com/userfiles/files/xisosavodorivev.pdf
    • http://pazarziraat.com/userfiles/file/pifenorajeranepowafesolu.pdf
    • https://gornjastubica.hr/files/32208117112.pdf
    • http://saimiri.name/upload/file/49619063539.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/6394604903.pdf
    • http://auto-rad.pl/userfiles/file/muxofakukopetexaruliwa.pdf
    • http://lnv-cnc.com/userfiles/file/6876643769.pdf
    • http://wskinbody.com/data/boardData/files/futejumefiwujuv.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/sutalogebulenogamidexu.pdf
    • http://fukaofoods.tw/uploads/files/202109120936383537.pdf
    • http://ncteonline.com/userfiles/file/natelozumesos.pdf
    • http://sns-russia.ru/userfiles/file/belafe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+fiba+basketball+live+stream+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16792 bytes
font_01_sfnt_off0000e483.bin
8ffd2af6414172a82d6a099ed600826c3a0d6176d921d3ed5c7c9c39de0609d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 17520 bytes
font_02_sfnt_off0001125c.bin
015721b38f601c3df36f60349b25046af652a6dac275261a0bcfec6739ece2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 10668 bytes

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