Malicious PDF — malware analysis report

Static analysis result for SHA-256 92768f77fe0a9bd2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 03:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac05806b548247fe37ed66c878db9a67 SHA-1: e2903688c92d090e868e6378f139494853f84810 SHA-256: 92768f77fe0a9bd2231af906e1ebadf43ec4565747bbf16f0c5bc2c67210eb2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gitedu.in/ckfinder/userfiles/files/ratazitakazikodidi.pdf In PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/3644901365.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/517bacc04398de28c3a1f33c798f8651/27364644877.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jesovuta.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/37765171182.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/78968196543.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/18507170945.pdfIn PDF document text
    • http://brukbet.com/user_images/file/rewutuzaj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01c1949f81---47930305918.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/birelasiligaziraxetunonat.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/fexobolojer.pdfIn PDF document text
    • https://olterus.info/contents//files/jagizenajizevajugig.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bakurakumonunodasinezod.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/173741eb25d50524fed5814bb86c2619/54970829829.pdfIn PDF document text
    • http://debten.net/UserFiles/File/xamuf.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/67766823856.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/zidozevupataba.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/pifuwufadifotisuporut.pdfIn PDF document text
    • https://renetravel.ro/images/files/fobixokegijamaje.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qqimc9rdii5ujhb77cra0if92a/kevexotisekifop.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/zuraxasaduwakubaxar.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tarelakeniwejevomegi.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/bedesorelovafesinogexoki.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cf798586fd86f882e54d7c7836ff2e10/sekete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wileyplus+test+bank+answers+organic+chemistryPDF 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_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 19768 bytes
SHA-256: fd7377f8c7b82cf12efa7b4d4c16fa932eb0f6caa2f459d37b833269e9ec3120
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 11348 bytes
SHA-256: 52119412e5febe0a8522d70a2e92a68c3c4c32d4b666db4b02fab74c263541ea

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