Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d520b4b9501c5cd…

MALICIOUS

PDF

87.1 KB Created: 2021-08-06 19:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65a71e4b3ff2aa27f2a3a3aadb1597ea SHA-1: 640bd9d5800cb14ff381ab2e3d791d3a73aa706f SHA-256: 1d520b4b9501c5cd769d7da6e0102e5379275532c6d0479ddcc0e65fefe1ea0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=biome+map+north+america+worksheet PDF link annotation
    • http://france-ex.com/images/blog//file/zezerup.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/larulexubasosawelefavaji.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/giregeguxexe.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ef589b3a894b4dd5df3b6513dbc9fb45/vepidodokune.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bdc9e9f4---47578492326.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/94456655614.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08eeb7201---vajor.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/62815168499.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3243ac570---66806710050.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/45134607378.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210616084828.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/71312353920.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/neduxoseberopufiwula.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/tasuxokupemamojuxunutoso.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ksc7ed7ni7gbhvsp1r0t2t1i1c/bogosikufifoxoduzinipitif.pdfIn PDF document text
    • https://designclarf.it/file/74625479284.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/77956885687.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a1fdd79f6---82163791240.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/duzigunidegaleduzeluvi.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/38464674688.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/70c5a7d686f9fab980615d6b0e40a426/64328178699.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/35c0fb32bbc321774e31ca0a30499d53/66115223704.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/26010499045.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/56d7a8df3a565043e73e60a5d859fbde/fijeveki.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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 16420 bytes
SHA-256: f6a0a2166e5f6b838a5240284c3f26f753b81e86b6fe4d920aa5ca13dc0eb77c
font_02_sfnt_off000134e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 10824 bytes
SHA-256: 5ab4db470ccb02186e3ff212bae225f7e2133b96f2b1e2d7b14869985ce8e58b

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