Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aab3d3e035397a1…

MALICIOUS

PDF

118.8 KB Created: 2021-07-25 00:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1591ff03c18d482b63119d2938fbc763 SHA-1: d6642f32998d32fb8cb2cb68f22ebb7a868ee981 SHA-256: 4aab3d3e035397a182fddebe22f9ffa865fd4fa4cbbeaf17d13dcaaee5279de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the true destination and potentially distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3391297cff---27939353691.pdf In PDF document text
    • http://ideas4mypool.com/userfiles/file/50515010806.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/tagilidogofusatiguv.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f7ee02b78fd67569285382d3ef04633b/71941256092.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46fd3c950d9c0efa5b1ef00ac5b96d81/rifowufaram.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adc90cae7---81227439154.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zaribevilupofulafomenamav.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c5cbaf1c87943f808ef56057a061beda/70713113828.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/71210967838.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/dabazivexaguwuvizemoxag.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0d5a11f26---takezudajepulaj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3fff5344c---65292639260.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/217d8c00b1f97645e41cabb50fb84718/gevoxunovasujaxaru.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed21ddf59---nifusek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b94d6ad0---88376238116.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/532d94778d9a19ed7787aefe636ff278/6087027679.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/sumakomupe.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/21b6ff176ef7dff9b9d548fd8c1b800a/25554255313.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/55457396212.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0910b73b1a8eaf4913d9cb0784c2ba34/56394176092.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa51f3fcf---sumuvawezixawizewesezuna.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mimonak.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/41537434910.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a885bb0db---gazirawumomanigoxifogotol.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/15138650275.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/21004652946.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/pemix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=desaparecido+en+accion+3+latinoPDF 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_off00016e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E51 10680 bytes
SHA-256: 6cd5aebf428259bbb24f861faa68e7f60920db7d4f83095322c1399b0821734e
font_01_sfnt_off000186fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F0E 17900 bytes
SHA-256: b67b5a71fd3ee250c6c9c052ed9ff2a256d827ebf81266c8a973be0d61bda67d