Malicious PDF — malware analysis report

Static analysis result for SHA-256 86efe2aa08e93423…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 11:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8176891db92c159c57561c971ea9cd6 SHA-1: 214e20ab427fda0a3942706f771d77660a6b9d17 SHA-256: 86efe2aa08e93423700de98fccaf1b44fd89521b55ea7dee1dbb565b5aebbf72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'utm_term' parameter in one URL indicates a phishing or SEO manipulation attempt. ClamAV detection and ML classification confirm the malicious nature of the document, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=download+gta+vice+city+cheats+for+android PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ba13d6be22f4dc7fc91f348e23792906/momevulezesaxixopekox.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d43fcbfc4---89839590085.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/dijuluboxafaxuxe.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/puguratixajexuzunuro.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/66696944709.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6879b5c23---85467857304.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/mubuxaledasal.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/42513938609.pdfIn PDF document text
    • https://laser123.com/geektic/files/40665736656.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/53940807591.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/towetoda.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/seronopusijixu.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/70190128260.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/42145830521.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161359eb15152d---tegolajegefevogaxuwawifek.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/wapalaladesafisojoxetuzu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/92002002627.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7609845186c8148ba7d206063deec32a/fixewigusomipegofasex.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/dotadiseleg.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210902_231830.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e57012bd1c---kaloteguwokalejilapiseg.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/xirubisifoxokatoni.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/69473075386.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_off0000b0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 16328 bytes
SHA-256: 7f02a070fb7e125faa88fb78a793b81b01c8545c517fd7908fa0f9e95ce6d59a
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 11024 bytes
SHA-256: c9b69570f34e7a953ac9b37e114dc622eb5bea482e15994e990cb157da89cc47
font_02_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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