Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed657d9c3e28b36f…

MALICIOUS

PDF

131.7 KB Created: 2021-07-01 12:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e5b4efd441d3d38573063f52e06378d SHA-1: cbdcf4ea77cba6c3fded7b760227ba8e35647fef SHA-256: ed657d9c3e28b36f79e5a7bcce1ee9f3fbba8e84fa027854c591616634e30b30
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure indicates a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=shunting+inhibition+definition PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b216d739119---pojewikefijitajapine.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb70d53b9e---gedejivodozinewi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607451ddb14dc---56506960108.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b343bf16d07---54669028920.pdfIn PDF document text
    • https://cooperspick.com/files/46968167158.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb035532409---2767098009.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/2c44a14hes5c9pibrfgjanom93/zerotefejuxunikujadapilu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/eae9efe7bdffed0f26f741b027b63f04/87780525858.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f26109ad7---kegebisazewijo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/mizuviziwozal.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f8a47b85---noreparabuvurezasomevuxon.pdfPDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2esvd7lpht2joedckeb12u1lk2/birakopakusaxu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jobtf45l5eu6u7t4ch5nh87leb/gaxinulixosimom.pdfIn PDF document text
    • http://zuche0551.com/upload/file/45036856109.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v9dsp624oqq7m380o8vol9s7p4/xisumazogivezutumipuw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/72b08299173892c8318aa30c3c8aaee3/4582444844.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/33906585540.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/rilokosofexokaj.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/u0ma93tnj9u4qgebd2kkpj1dt0/gebivubabesonazebadefijaf.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/tifonaf.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4c3571fc---suteluxonodowokeverabiweg.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_off0001a18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9A1 18268 bytes
SHA-256: cb616e5795a10277311afdc8931d19a281d3529c9623b23d92de671a03dc8338
font_02_sfnt_off0001e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9F4 10472 bytes
SHA-256: 887ab232393c5f26569b9a18ed37ec72e3d7380dfaa9fdd79dfe76aaa66204c7

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