Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0e5515621e8caa…

MALICIOUS

PDF

79.5 KB Created: 2021-10-08 04:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e80aa359ebf163267d7d8e7f97acb36d SHA-1: e1093a58d8a5318020630021a682e41a2e5c1bdc SHA-256: 3a0e5515621e8caa66e9362bda546cbbd579aab7711c48ab3050c7b672b55abf
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=convert+pdf+to+blue+ink PDF link annotation
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/mogexavevugibonimek.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/xuxexudapamixenufazuzare.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/44552880579.pdfIn PDF document text
    • http://cartopack.com/Images/file/60236041904.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/70502066303.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564d7476c61---lugifisivivijexofutamipi.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/44373616914.pdfIn PDF document text
    • http://stefani.cz/fck/file/19984243955.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/88077627185.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/kumojiso.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/mutujap.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gezipuzuwujeb.pdfIn PDF document text
    • http://hongdacable.com/d/files/6733167564.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/mudemetoxeju.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/10308903527.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/jufabuzozataxo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/813337b6ea991e2b84ca1fb7e2ed3971/lofejadutuvoned.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/71111506571.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210917_84040BBDC1A2ADAA.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/79286215196.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/768a504bccbcd81ed05c5064672a8e23/43106223083.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/xuwafawigunurutos.pdfIn PDF document text
    • http://usmleworkout.com/files/file/10391085935.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/73419529967.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/47250655759.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_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 17892 bytes
SHA-256: 72be6c07f1d3ce6fa9350ed56e0b79da320679d3fe8792571843dba50cb408bf
font_02_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 10588 bytes
SHA-256: 4ff51ab3bbd0f84b9c13233adf1ca43e10ba8468ba396c27973edbc105cb9a88

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