Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a971203a2faa69…

MALICIOUS

PDF

86.8 KB Created: 2021-08-08 00:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55ce887169f7fb479fdfccb22fd8bd28 SHA-1: 888bcee23c584401bc7dfb0825f843f063e78342 SHA-256: 94a971203a2faa69f964f9adc44025613e51cc6c4815c1886323f29b6936e173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=marvelous+designer+7+enterprise+free+download PDF link annotation
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/lowumafinew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e334cc0415---56403657074.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5561c158a90a143493bc46ce35605042/59931427174.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/raxodesawezi.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/69061363876.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/pebipilimozo.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/nexosepukikukubi.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/fabefevefodewosifofe.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/tenaniparukani.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1964eecc---wiwurijosovawubuj.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/vugoxofawatexidolopapim.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wawokerafebefugan.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/77842478265.pdfIn PDF document text
    • http://jkohut.pl/file/fepulexoxewadaw.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c092d821---11518618323.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/fajuruzutamuromofujup.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xumarelitavenilapo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b069352e0f4---91168829958.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ade7f8e6b8bd5017bd3a5068e00746f2/kasaxuje.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe89bc3a4f---4779770163.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/h58cnivcqc7hgn1d8qfr65sa3t/murefonorapeferotub.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/dbcdfae5e7f84f8d714541e764b845ff/85769495429.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/11171514564.pdfIn PDF document text
    • 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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 10968 bytes
SHA-256: 1d001189f46b65b236546aea738f1516d33ffa6a372e0749b1ec50675847f50d
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16884 bytes
SHA-256: f98202ea43e3a8920fafacc2e2ae6c4c178013e1a00df72e3e046dbaf24df553

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