Malicious PDF — malware analysis report

Static analysis result for SHA-256 f191deaa5525cced…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 09:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b286a7a171876c7a1d8589e783abad9 SHA-1: df1663c029a4bb15740067958646d1f7daaff18c SHA-256: f191deaa5525cced0e8daee9fa803a1c8a6f4452aa34957c627913fab09637f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://trunglam.vn/uploads/userfiles/file/gufopovexizetipibuvovufad.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/pigutexekibedabigegakap.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/13876897590.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/96731614741.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mojipukizawanewizuz.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/53987223196.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/10614426326.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098144d381f8---dunogiwa.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36134838883.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/41qrfl2hqjvptv1ugjod7vcs4i/99583857538.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lejubudegisurinejumuw.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2014d7a---59855794565.pdfIn PDF document text
    • https://foulardfotografando.it/file/mikogobisipoker.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/41739672378.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/85563650948.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af670902cc---nokizalafukovijamugila.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec7481508f---69096549383.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ccacfc4ee3b---ketumavuvukewimotesoda.pdfIn PDF document text
    • http://expresskaliski.info/file/57088020794.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/76cb38875c54fd69e54652841c6c837d/76984681409.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/17211612798.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/97777413017.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c2068852---dirawifobixet.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j7mqb52dp5af9i4vjee2qkgqkt/jejizezupiwud.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070be985009f---28822440861.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/wumofixopulunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rectangle+identification+worksheetsPDF 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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 17572 bytes
SHA-256: 582713b486dcf4ef34f890845577f6759f691bcc947e6113c4f21705360ed630
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 10976 bytes
SHA-256: 3290dac957c3541c982c5c6f507904bd08b6d188194d21027ed962c2efabb2b6
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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