Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea707a36c5ae009…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 21:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dd9e1779e6d924194a4a76ab18e0a845 SHA-1: 19d5719e01a116fae2a3c81d1a6777c4f62e47c1 SHA-256: 9ea707a36c5ae009c5df22563cdb12ad590a2a03786375b9264d0ea070b8a3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=margaret+atwood+and+the+handmaid%27s+tale PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0v18t112olg92ako1psrrqisag/44475035674.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gvvgkcuk3190u56cg7vq8ms3sc/37665430395.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f05adcdd---vagigomitamosiluf.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/d0h679v1duiml7r6td77b2fngc/doweluwoxazuzexotire.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pvfhl7ruehpo3tar123as35f53/febogudutu.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/81048018230.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609340eeed31b---zesobopesajosikuwujax.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2ca3d140a5---zosoxusiroso.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jebo1njv9jls5m9rpaf2sllp51/jonabexalokoveladenuwin.pdfIn PDF document text
    • https://guijek.com/userfiles/file/46333787563.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622317956.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5a1f4d0a48701cbde06bbfed152b90df/22829738579.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/552afcb11ea3a5c5a59a0e4ae4e276cb/73300796296.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/511e3205202ef181098b18def9f93b18/mobifimofinozofimiw.pdfIn PDF document text
    • https://asi-filter.pl/files/file/52661854204.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/mukejenodebedudomilazifet.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/mawiriwekuriku.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607001e8ecd4e---44690572184.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/81080623681.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jewewet.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec115b9377---weladazor.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/58511658112.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/bowuzotozibuzazar.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/tusupabowogozulaligo.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_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 16592 bytes
SHA-256: 3f0d20531580a6d2a957bd63ae645c6a6fcb06569bdc181972fad0691042860d
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 10808 bytes
SHA-256: 7ebce34040ad8efefb52fa41068c733d31484b24ddce62f237b75c53be7c5dc8

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