Malicious PDF — malware analysis report

Static analysis result for SHA-256 da799150331fa9c2…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 23:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec1b5bc6a71eaa8d6451abd6c2f6e129 SHA-1: 9b0b860e18c924acc7d3c8a7ae02768f3c6c48ac SHA-256: da799150331fa9c2ed59ce11ea76fcfd2ad2e8a93bb141bc48ed051ca28e6ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=exercise+on+percentage+for+class+5
    • http://didopack.com/files/59652968098.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d454f286e53c39c5d307d118122e6c95/75307682318.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gov27u9g60i4b6d7us3lb74gg2/30895975850.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607910643c183---nujelufu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd161ab3ec---79162295353.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/u8fpcv7lo0q58hknbetj41o4tf/80132958812.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21da858d5---wapado.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ae144e0b0735c9f35c2cb4882f92d9f6/35443748339.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/38e9ce064f8765032e9044c0fe578973/32865466659.pdf
    • http://yoron.net/up/files/6537230008.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c89479fc5fb41617a34bce4a50257172/42935233784.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ca0a90f3---komupubenanari.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/letukizu.pdf
    • http://softwarefactory.nl/images/file/14148635670.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f505b659b4---sebozos.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc61b9127e---35439486600.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccd3617f1---60542525030.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd7a0d8e5---janesusexirejakasugadoba.pdf
    • https://thietkevuphong.com/uploads/image/files/lolilose.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7221b3fe55ca27398a3724f9ca58ca5a/pirogiwanowoturamubavoxed.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1888f7e959f76db4d8f2d69d6768021b/55317865464.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c3671c7e---sukunakagugawube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b0.bin
58f59f453b310606b48b1937a0911fe06e7c5fe64d2d591a40abaa5df12e4239
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 10876 bytes
font_01_sfnt_off0000fd05.bin
4926f7fd9e567f49ca58f80eec0893655090fa2177c7fda84e01f42233d288e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 17720 bytes
font_02_sfnt_off00012bd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 16792 bytes