Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bdc31f1d0eba33…

MALICIOUS

PDF

76.1 KB Created: 2021-07-08 18:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59373f3e244a411ae3dce542bb1fe420 SHA-1: 93163c6f6e84d43a6456923a87eff54351da3585 SHA-256: 61bdc31f1d0eba337a1298bc182b627ec167b61df1a9cd4330deadc9c630dcc2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a081192a90a---dafaw.pdf In PDF document text
    • https://reparation-mobile.net/userfiles/file/22842414271.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bevufozuvixedif.pdfIn PDF document text
    • https://argumentua.com/i/file/21243161995.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/90249737228.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/67808156844.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c778ac1d8b4b791f7fb6752f9971c8b5/14175233138.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46a94359b---gafusix.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa5f6901f---jakav.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jelikofuva.pdfIn PDF document text
    • http://vinmexindia.com/uploads/6510431977.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070530e3d559---10576318265.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc18189e7e---wiguvevagodifazupesimasi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a39e8436e---59384807128.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vudeledajotitimapasejaz.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49t73rkta2kf2jeba6sdr31u45/gaforisi.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/be6c545985d92c28fa540e4c62de1215/mivebuvugal.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/13106308909.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/nogibiruwanuwosesod.pdfIn PDF document text
    • http://abwessex.com/uploads/files/ropubomi.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/waxovutuzanenefaxiju.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210614175334_ughgpi.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/gafuzoj.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565d01dce3---jebemevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lcm+of+308+and+420PDF 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_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 16788 bytes
SHA-256: 78dbd9939394c5b0889e4b152d6ea73a8de7313655861df91b5e9b41ba75aa85
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 10656 bytes
SHA-256: 5f97b24b15e5d18b06f00ff16cbefc1f6f72961e44b40a62f6be0ced46d48bb4

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