Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3f45fa8deea9cc…

MALICIOUS

PDF

82.1 KB Created: 2021-08-18 22:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6e9135eeaf07d7236c6bc6b62721a6dd SHA-1: 07a3ffb624aeac38fc096b7ca15481e7a446d27c SHA-256: dc3f45fa8deea9ccaee27f1e06206b1a480071cd44ca2c6e3729a984cf8bd6d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://billedbutikken.dk/articlefiles/file/funodepitodepepusixa.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e36a2668c---nikutul.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d27e5b36b---53630269021.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kowamumowarinaga.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611159b64c3d3---bagotekefavukuta.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/sosigutomomama.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/nujureperubikixebu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5fc43172---65761654103.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sepifetopizuvenajoguwamu.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/16261433671.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/2649555512.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/jgc7ukhf94u9bgd5n4vbsmtmp8/vivuleb.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/zurebif.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210808_92BB75090AB72007.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608018b928c06---migakinimipafulib.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ffv1jajvac4kliu69cufdd54l4/bozusus.pdfIn PDF document text
    • https://partnermind.cz/images/files/feraxazidijosase.pdfIn PDF document text
    • https://luminex.pl/upload/file/1615075166.pdfIn PDF document text
    • http://15881588.com/ckupload/files/46755559375.pdfIn PDF document text
    • https://gilbertems.com/videos/file/48037769684.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/57000475152.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34195976d0---37081723215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=breath+of+the+wild+owa+daim+shrine+walkthroughPDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 17280 bytes
SHA-256: aea63d73f3f50a17d85454547583a8caf50fccc9e8a706119638d5323d65167e
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 11132 bytes
SHA-256: 7af0a211427d2a5ae9fa32140d38e0c8b87646d0a4f3b9ae64b09480055f32da
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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