Malicious PDF — malware analysis report

Static analysis result for SHA-256 f545660d61ca01f1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 00:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 20baf36ad54ec6b2958f48f15d1d3b02 SHA-1: aa79ef3cc13379d86958e07953f49f20dcf03b96 SHA-256: f545660d61ca01f1b689f68e27a1c4b126eee1a7eaae73441390e1f315e63870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610896e6d69ca---fogobuxamofijepasuladuvox.pdf In PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0c67a258---21282637088.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/kuturutikaj.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/6547084203.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098af89a44a6---xugedebasuvek.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-10/20210810021721544741.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/tonuvamaxojizamifulu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/22054145290.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/30602984876.pdfIn PDF document text
    • https://kartplast.com/resimler/files/4249635015.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/55803522826.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5952e96488db661b2a6e6fcc4fc436b4/16286935768.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/62692eb8b6050f887f93ba941310b8db/83561746105.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ed2824fee---81132126557.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5e66930c11329ce8da732a2ffef1e382/rigutenifarirojeferunigu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/vbdn7t1eeajnec25dbvocgvmk3/wuwugedagejuba.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a76823138509f42e64c7ce3624cfb4ee/22005360986.pdfIn PDF document text
    • http://tfforming.ru/d/files/46943003758.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/50734979599.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/80325107018.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/53459129001.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/meramemefoxot.pdfIn PDF document text
    • https://aedwea.com/upload/foto/95928329939.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/woriruvulili.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/74409022297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+set+adobe+as+default+pdf+reader+macPDF 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 18408 bytes
SHA-256: 36915fe48ba4e05cf42089e5df2f0c1f1731e799503e9c84da5fc4a3327ea377
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 10904 bytes
SHA-256: 0f39f9b14358886fc5cae6f46e42e18d1f40b3c7cc8af804678919de2876f3d8
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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