Malicious PDF — malware analysis report

Static analysis result for SHA-256 153fa7686de27f27…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 19:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70b66a480e2c6ac1b8d7bf9c34949c9c SHA-1: 0367ce827949d493e114c4b73fe51363c9d87c5a SHA-256: 153fa7686de27f2747651f78a7ec5e78796bc0be87134bd3a7f5b7a4e81cecd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://allytemp.ru/uplcv?utm_term=dababy+rockstar+roblox+song+id PDF link annotation
    • http://cdenito.net/userfiles/file/95433552442.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/31700083251.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/61650796290.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9149d7778---67136033826.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/62469278327.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/54146890439.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/27900779039.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/80277279754.pdfIn PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/tomerowuwarekuwokusidi.pdfIn PDF document text
    • http://badgerhillfarm.uk/42555906122.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/73634483595.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/rutuzesotorit.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/18563405375.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/degurufirijibe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jjrc2cu7ql2biv0eus6dikv8c0/74398267045.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fad25b9f---30403004423.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c209494f4f---42780439906.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/80857971030.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613048a0823a4---mibexen.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/42550679009.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f788556e11---30112974073.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/rudatajidezazop.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0291e4420---1494404249.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210917/file/70316965424.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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 10864 bytes
SHA-256: 37469305565ed6d62e246560f47a60264fb8f9d2b30125f45cad6590eca85c86
font_01_sfnt_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 15704 bytes
SHA-256: f8e7c30fc1a45ab4af89b4f6c45b3e8b44e5a0a1aede55b909854fda32484110