Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d30b02aa1a3d986…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 05:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fac625658afda4a884c6c8ca9fb8acd SHA-1: f23f182071a97036c525ed1180b9199cd60939e3 SHA-256: 8d30b02aa1a3d98677dec44ec6d5311cb110e75dcb4fc9a1b528734ec1b99beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful content through a series of intermediate links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/rphvn7gm5fl176viirfr5tm2iv/pijotuxep.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d285f355fe0---xenuguwafenefukom.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/u0hus4a4a5sh2s08ulilukk08p/gojetanarobirefupipufebow.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/visawomotuk.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210530_104344.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/kiwisururazumowaxokewav.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nevufuronoludozizoripoz.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/befipekozokobarironivatol.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/64656714765.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/814mm9svbp7l2oqe17ar26pkkf/9155272222.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/259d33r9llb213969r4p3t90vc/39328786433.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e9argi9nri8153u1819uvdpvg7/godemizirodunon.pdfIn PDF document text
    • http://brlairport.com/images/file/45186316299.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zesuwiledezovinujig.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sibovarurezisoniporubaze.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949843aad2f---89998576090.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/xebisunevapipuzodejat.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099cef79f83d---84593683428.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d28554914bbd006588bf563500c99ab9/gevogura.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/82027805350.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8740d1ffe---wotezamuwop.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/47141835803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=developing+writing+skills+in+french+pdfPDF 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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 19136 bytes
SHA-256: f174ec8851d1351bcef63f292d9c1e23580b5ce91b487ad3c79c24738afdd0e0
font_02_sfnt_off000137e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E1 10984 bytes
SHA-256: 222ef8bd50d31df24a9f087ebcf554f066b20e3babe2d03e2062043189bc8f3a

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