Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b584031cb180c6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 20:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 17c0eff7affcb6070e98f806cb880ee3 SHA-1: d2d9b039ae89da5e54aab7f0a61be7e13bc1d242 SHA-256: 42b584031cb180c6bc61b201348682f4841864b401682da824fdad24ae3a2578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to potentially compromised WordPress sites, indicating it functions as a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=watch+one+piece+english+sub PDF link annotation
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/sogamefupino.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/badejapuleduni.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/93038780316.pdfIn PDF document text
    • http://headrepublic.pl/images/files/72805689771.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/99114469005.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6a68295344a17e99b45615ac9859ed26/44357843417.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913035017700.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/to4l4bqvmud5m44qhjgh341mcp/zoxomovegavalamajixipe.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/49057554527.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57468b983c673ab665aa3586cc013797/33000930044.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/77167582650.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/sofajifas.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/56576873625.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/10901737750.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/raxiw.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141a620e4cb2---lojerusijejanijenoja.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139a553d53---29673755414.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/76853228437.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75388d6be---kolulajadawamesaxotomag.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xajufowabitamidimejujiv.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/lureluf.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/2538346710.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefcc47baf---jakozenixuvatuvapedodug.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_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 20680 bytes
SHA-256: 377b3cfd55e36c5138a8379ac73c5473c53e4f385c96cf6303cc212cf99bd4f4
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10784 bytes
SHA-256: be9ad1f39aae80c41edb7a4d70a4b4fa1b168e30b5ccc8ed53aee53b2c9e3672
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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