Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083021d54d64215…

MALICIOUS

PDF

83.2 KB Created: 2021-10-08 17:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 10c0a9e30fccb078c345b529a2e1ff56 SHA-1: 224df1b00f4a1c6d17c48e8c87d5d6a324bd4f21 SHA-256: 1083021d54d64215f34ff1b6176802c6b33d54d69bb46c0da7b2b909f7f30645
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicate a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to compromised WordPress sites and disposable hosting. The embedded JavaScript stream suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=if+ldl+is+high PDF link annotation
    • http://cybernet-ap.com/UserFiles/File/68604779934.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/juvubiravagoxamuju.pdfIn PDF document text
    • https://banghenails.com/upload/file/luxibivuzuxesuparun.pdfIn PDF document text
    • https://tebra.si/userfiles/file/861651050.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/38057701088.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/70505259693.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/36153033759.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/36490301201.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159cd9e323b5---66390626093.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/zenapawunuzemubojug.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/70741124101.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/paguvomorevoxuwobu.pdfIn PDF document text
    • http://ledins.lv/cms/file/25432253874.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/ginejunomegipifojenapemo.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/maxoxe.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/jofokalizeboji.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/bibutumipenizovil.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/nutoxebipagomusulidevi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c920a812e2---wijorowepavisofamolamemo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/211002170310121133l7ot4y.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/11152191566.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/jekizopawo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pitawow.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d626da5f13---punuwujeb.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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 19248 bytes
SHA-256: 97c0c48cc4bad3025a97b24a43b68896e82a32095e0deef3600203cf16a65e7c
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 9868 bytes
SHA-256: c479a934a142fe4adbcaf862ae2bdfd267af978356ff65bc55578b2e98d13b64

Open this report in the interactive analyzer, or submit your own file for analysis.