Malicious PDF — malware analysis report

Static analysis result for SHA-256 17449e3aada04f9a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 21:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9aa4cbeb73d6b5b7f89916b3f3ceb414 SHA-1: f3d7fd806ab38ed15666b0d67bb6c2ae2a8fe2eb SHA-256: 17449e3aada04f9ae2ba8ec506e250c316acb5e7866377df713e76f15bd7c34e
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of distinct hosts suggest an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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://archism.ru/uplcv?utm_term=class+11+chemistry+textbook+pdf+download PDF link annotation
    • https://retake.dk/ckfinder/userfiles/files/55929624753.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1398iiq67jocu2a6m4ddc6raat/faxarabegafirijatixeb.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a24a30af---xevomuzoxer.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/95158361274.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/31888244559.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607825b20c2ef---muvevunarogugufun.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe77992bc---putar.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f0c0647ead4cd682bf2043e66b3610c4/50748461134.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/80859138858.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5979360ca1305a639f92f54ad5048759/niror.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ff8d3254b599e2e03985f434ca627cb0/nupipuwonati.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/zipoka.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/61304676770.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/fuzukefuvo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e9e58275675df3cb84f7e626ac3d8b0b/sapaxerid.pdfIn PDF document text
    • http://agama-rc.com/upload/files/7561534168.pdfIn PDF document text
    • http://talleresjpg.es/img/file/danixozuvoloteb.pdfIn PDF document text
    • https://faprosid.com/file/56705894209.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/963ae1l7m6gen77evmarb093h4/duxesif.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609650176ea6a---27246339907.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/garekadinigixitedebalumo.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/62754556989.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cda23de165cadcfe4587a2460f2ad3d1/disavir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 16720 bytes
SHA-256: 4bcccd18872f13cbb1dbc48de3f6181fecbb88878399f1e283e172569eccf026
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 11504 bytes
SHA-256: c03175c1be139dfc6f8080a02161d8f2824b4af7273a7e97812ca0731f59ebf6

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