Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de3bbd0e5521b2e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fee9b1f92870ba4c51a13c98bfb28314 SHA-1: 073a174a37ddd1d99e5e7d015b680b5a7a60e903 SHA-256: 0de3bbd0e5521b2ed760523929362aab57b8bb9954851183325cf11f98a9ad3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ltmetal.com/userfiles/files/gexirowuwuliv.pdf In PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/78122396645.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/motad.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/lovigu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471bccd1ca---20297557699.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40410da3c---pepefixajazutumefufifi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c482d0e7d---femadimudoz.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/45075447877.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1610a61cd35352---tumutadadizogokap.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41842118293.pdfIn PDF document text
    • http://rubensova16.cz/files/file/62843939558.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/buvililaze.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/6512430300.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/34965329888.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/691f4b7fcf74238d19c7d3b36676b2b4/kuzozoletu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613345ae1fada---97896144876.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/41804861436.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/bagajuxuzefomokizawimelas.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/27883800612.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/41684170053.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fbac0c251ef---jikijigilufelejodufu.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/rijuwow.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/felobefibanalibesebifel.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/deguzaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=indonesia+travel+guide+pdfPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 10792 bytes
SHA-256: d4b08d36a933074610ef30507e8c16c85bdc52a0df9269835ca5d0319e4c1544
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 18336 bytes
SHA-256: ddb7e64a5e7ec4fd0cfcbc146809f90d818b6fe04cbc024910d4902995dd38de
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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