Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b83541a163f1d2a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-23 13:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d60ed7d43afb7ebda2e86aac60741f8c SHA-1: 51f885b21f7c83f5ffdd11572b9f97c07baab1c6 SHA-256: 2b83541a163f1d2a315e7ce16443adec70a8f86e6ca7a98b4f44584b2d61b368
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fa5286b35ef38bbf400a4f889cb77855/82250375848.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/39864608412.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79c19ca7e---82019191420.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b50408b2fae---87096552179.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/45555427650.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078338c5d4d6---34710055580.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///32636160519.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/kujuneti.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7057bc503c---9599260476.pdfIn PDF document text
    • https://unitjaya.com/contents//files/mudusavelovewapefex.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/68792801110.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/jisudejerugamisuka.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/donimod.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/pozurutukubenibexedofe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7grq2oeiaibih4i5415kq7af7/77445777618.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16246594971007.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/nrv5evv0blrhopigmklgcsjl17/93111730752.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/dufisapopulep.pdfIn PDF document text
    • http://builderall.info/userfiles/file/jipetelilurotovup.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6f81c44f040983564ea0b8404568a6bf/sevemevupofanoripo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a7411c2b---kowoxeg.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/wisogolinedazu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ade7eb44ea0851db683fba652d10502c/24767352921.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2840dcfdef371560d0a13050731dbbf0/32806404687.pdfIn PDF document text
    • http://simonide.org/userfiles/file/desomilotibarekenekisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fallout+nv+enclave+power+armorPDF 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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 10504 bytes
SHA-256: 97979445586ab5ad7220605edba957bab51edd7ad44c890bc19a4bc5021927ff
font_02_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 17268 bytes
SHA-256: 2a87971f776aeede9359483e5ae372f67223f1d52ee7591e5351702e68bb0da7

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