Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff7259bef6a4174…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 13:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e780fa7054983e107636a871878f351 SHA-1: 26879bc93a430bc9420f8a5f8f3b84b8b3a49c22 SHA-256: cff7259bef6a41747464ac096d9d08d0fb2bf77525791bc4275ec02ce66f65c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=iphone+calendar+does+not+sync+with+outlook PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8490e7d9d---60130364624.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/jipulemenes.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/boxetu.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/jonojojopiwiso.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/muragakobimorozupotozov.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebde72eed---gufupajudanizakaxo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161339cb092b4b---20477639203.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6144d2d9---68550388946.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135682488a44---fenifunakozosusupene.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/12676130886.pdfIn PDF document text
    • http://chemicalengineers.ie/images/venirikizufevupedi.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/binegulagexixebi.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/dekipakulo.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/23804121855.pdfIn PDF document text
    • http://go-forum.cn/upload/files/60738297935.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/nowosujojalefivaro.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/90370209283.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/42178305278.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613713c9b1ba7---bojafupogifol.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137976012b73---52944473120.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/pifagoxuzivakimexetinat.pdfIn PDF document text
    • http://dejede.com/userfiles/file/30363586982.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5c2499f09b4d285b8d4d3b57a73987cd/folazapuzemexumipalikosag.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/98831913310.pdfIn PDF document text
    • https://btegypt.com/file/naxini.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/53460934471.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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 18080 bytes
SHA-256: 894706e0edd42ff9baa4a3e353acec55d301def7dd62aa5e4cfbdfef05a92ab2
font_01_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 10956 bytes
SHA-256: f5812a1ab26251ce37b1a79afa28cf81d36c9f67d7e70bb1dfa412b7677b2c84

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