Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7b2e33d919e910…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 00:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 1c49766250994349985b0335428e9437 SHA-1: 6b2e32fea954c6d9b594a07d6cd067343f6e61f2 SHA-256: cf7b2e33d919e910cfdb5b43efa3d032baed80ed5c2c4445b965397259844ff1
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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://irlanc.ru/uplcv?utm_term=how+to+root+cph1937 PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9bd07177---wakawisajabesegujuriwe.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/wijirevirep.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/panib.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/91274496448.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/84745679973.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wujefevikalipepadujul.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/07152719133.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/90521511543.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/65280081374.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/lopunemi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/simogas.pdfIn PDF document text
    • http://esangsok.com/upfile/files/39536329325.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a0da0d12---24472950150.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/21452028858.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/6882500830.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/81ao4voa6ajcf5m0b36p9frkv4/xulorimewem.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/xikobot.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xewakiba.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/bupelele.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/3184231709.pdfIn PDF document text
    • https://davnosti.ru/upload/dujotopetaxozuserom.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/bogivukalikuwovakakewumi.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62832698809.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/41621268874.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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 10288 bytes
SHA-256: 348ba9664e5d0083412634c0e05deaa7471f2775744d05b1418604409e8fc9e2
font_01_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 18016 bytes
SHA-256: 958056d6a22ad74378aa44422da28dd465faa3e4288f752bce0e6ee9c7e403f5
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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