Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc04d8c36bbcee7f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19ac39a2d15bfeda3cb57c56a3d92a4f SHA-1: 7fb24b138ad889171087f20253ad4b3bc7f770b1 SHA-256: dc04d8c36bbcee7fd73580fe3d3f59c3873083508c32974191fdaf220551db27
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the document, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://inwebjor.ru/uplcv?utm_term=pdf+stempel+erstellen+jpg PDF link annotation
    • https://davaocarrental.com/images/file/gifokazurufiben.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/kelubisi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/63479646113.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/5029733114.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/83227620647.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/65894866216.pdfIn PDF document text
    • https://signika.pl/Upload/file/solirugimazulamofunine.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/103ff970f0faf16437c286a6bbff78a7/biwumitifukafuvimijapak.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/viwugigefigiz.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b1813d28a7be363886b724f50da14872/bexafasiwekowerukom.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/dijejijekesevikomew.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3onpinhqnolf4bctqtnbuf3b31/62535282592.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f4fa49c6---sogatijaju.pdfIn PDF document text
    • https://brakos.it/file/25664628394.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120fcac0cd89---morovobetisatov.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/10860382448.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/penomo.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/77110434604.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/boretelekoviw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5d745f95---50050012682.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/2901933691.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/nufazawulokitumokose.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/97984910953.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_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 20372 bytes
SHA-256: feacb700bd6b934017a57e6bd1a116598a36e0a514b34fb01c1cd8f550e5bdf4
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 10596 bytes
SHA-256: 74316dc5a908b4a36c41474409c98004ccd23284e69fc15eb8ef5fc5ca3f459b

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