Malicious PDF — malware analysis report

Static analysis result for SHA-256 a995da5228cb87cb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 02:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4df8a7f6817d61a1c570c6fb848fb124 SHA-1: b6b1ca4a294c637412d904bd602943836719cd6d SHA-256: a995da5228cb87cbdf15130775fd3fc7e91deb35d183660304acca13e4c457d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The presence of 'utm_term' parameters suggests tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://webinaris.org/ckfinder/userfiles/publics/files/87988138881.pdf In PDF document text
    • http://nesthomes.in/userfiles/file/vikozomowakomazunokel.pdfIn PDF document text
    • http://honghuibio.com/d/files/lotivujapiwararofo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gsq0ik55atp8mjjb8q3i84ssc0/negezifuk.pdfIn PDF document text
    • http://axwelindia.com/uploads/24879078501.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ca604b1440e4eec30d0acd26faebc62f/8741886431.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/zijadod.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/11163670926.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2c442ded---32754679880.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/pavumitefuf.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/lulogadakujomew.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/76885215132.pdfIn PDF document text
    • http://kammed.com/userfiles/file/gedifaw.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zurobekuxorasi.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/fuxemupugazadeb.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/zisamuvorosanosutiripobo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5897bcf373---dibafawufopixorafilagos.pdfIn PDF document text
    • https://medtek.vn/storage/file/25245106718.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd11bb0ed2---jejafudag.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4d0f28dc8---kavepozunevazusewogos.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/87448886807.pdfIn PDF document text
    • http://uchid.com/uploads/file/83217306388.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/49690111412.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090545fd9d50---mudafukesebisodukemuku.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/lupumesebivutasubunux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ostensive+inferential+communicationPDF 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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16440 bytes
SHA-256: 6f7eaf792e874ac29dd0f4daf4b2101894c1b383f8674570e6948046390a95b8
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 10688 bytes
SHA-256: 39d0e89b08c004fcfd84c2c2f7810dbb61b670cfc0349c15419724726fc71134

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