Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d2fd1cc2c0e043…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 20:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bfbbfb38f90b2f5e6036f66474c364b SHA-1: baf3a5f128599e52af42af4f8b43b5fec1a70ef8 SHA-256: 33d2fd1cc2c0e0434a361360792c94a3f70525233d2fc51fa779e8c1cb83c897
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to obfuscate malicious links and redirect users. Heuristics indicate it's part of a link farm pointing to compromised WordPress uploads and disposable hosting, likely intended to trick users into downloading malware or visiting phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kstarsmall.net/userfiles/file///tiwaboxubulizukenijom.pdf In PDF document text
    • http://alemotta.com/resources/original/file/9029339829.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210912_162759.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/78999399284.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/29770668471.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/80099229761.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed67118ceb---74601220655.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/64a4437707ebcf212278ac54c50695d4/93556527045.pdfIn PDF document text
    • https://trainova.com/userfiles/file/84988609955.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/72880142858.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/11838355528.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/40311940365.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148b29fed049---kedisapajisadaxudodabepe.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/nazoboliximatebizov.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/95564429.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fawazujiwujit.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/sugajiwopot.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e8220da48d03899d0023f04419d74378/87815723751.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/patepanopezatufowapenof.pdfIn PDF document text
    • https://trexanh.net/upload/files/56639755795.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/93062511816.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907225101_6hljw3.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/96686770879.pdfIn PDF document text
    • http://word.mn/uploads/assets/29935620161.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/tojidetazixazufalop.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-11-28-34-12.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/kepalonekanaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+playstore+in+iosPDF 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_off0000b70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70C 10588 bytes
SHA-256: 7992dfb59f7636849627649dcd6df59c0689d1427df7fd836ea42d0709bebe67
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 18316 bytes
SHA-256: b617ac74393193da724225622cc8a27f6be173ea59da0c19c2811b6c8bf35f01

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