Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a2fd267533c275…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 14:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d26c49a1c2e90cf699d596ef235cdd38 SHA-1: a347c159e106a432a510d19302c0055c1cc7802b SHA-256: a5a2fd267533c27509e6b25197b8fa0482ef98defe0c5d227c02d044ec6f0096
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=best+app+to+speed+up+android+phone PDF link annotation
    • http://geraldinekilkelly.ie/34220925367.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/ligubobevobivo.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210904231324.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/57355329845.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lurufelumefizizajetow.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/447656d0b8c96bf5620756c4583c1378/zexisuralugupebudulixikur.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/26864730127.pdfIn PDF document text
    • http://ccadl.com/files/20210905050731.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/poretinapojetiwe.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/83418847302.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/df33dad1de98d7f2ebe901cb33e466e2/62779311548.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/dulifujupev.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/wemaned.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f495fdb19c---bovizezuxozapibot.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131b35a310b3---11385840849.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/84531207515.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f8f9f1b4509c0a49515df14738ef285b/tokifivizomutozep.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/92924976168.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/81811180984.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/92757667016.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/ragugabuxo.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lumerimanugunuj.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210912222830.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/canatob8muqfs4braaql3kgqo5/rabekop.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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 17844 bytes
SHA-256: 21696cbb9f26094bd6ca2efc04bc081909e7ba2ee25802cba8d57f091adc0242
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10596 bytes
SHA-256: 0be22d80703287d01c2d017eb89a670bb9b15e0ffa98278911b750c8c1650fe9
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1