Malicious PDF — malware analysis report

Static analysis result for SHA-256 1528f51d90ca9a15…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 03:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9dece7f24b473d77a3414b44a00eb4f9 SHA-1: 0719e8675bf97e58b0e6258afa0b54121edf57f2 SHA-256: 1528f51d90ca9a1523005e075bca28eb668415a90faf87d9f0433124f0890e8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://adium.ru/userfiles/file/83963787801.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/geritixi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/a0r16vdsr0jbdbppnbn716ve21/sasubopikukajolevogobosat.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/67789543520.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/2695066593.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/bunutag.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/nejutof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5c2ce991---kasedakabijokulo.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fodakobora.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/punudenazokukexosekixu.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/3704907131.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/rujigenevugomanobub.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/mobufigi.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vadad.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/81274593846.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/62049133552.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/zapaperilowafusepoze.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/18380453201.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/misonodijutofutisolejov.pdfIn PDF document text
    • https://novsport.com/content/File/wudalizagudowepadazu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135616b6dc3f---wonogenodifu.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/dubofu.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/xivivulukojuxudaje.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/nufesevamazololefibugaseg.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/68322797373.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/famesaxetow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=usa+live+stream+freePDF 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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 10224 bytes
SHA-256: 56f29a2a98861f24fc1a6d2e5e4487218a7e6fcd9af5c67489e01a4dce8a7157
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 17720 bytes
SHA-256: 7baed6af72a75aa1f1ca531ee92ac171ee57b4964e07c542e3af7e189f4ecb24
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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