Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83ed0a66daf1b5b…

MALICIOUS

PDF

68.2 KB Created: 2021-09-07 01:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39a5780a3bc5122106eea279d0d9f71f SHA-1: 6169d5120bb285d2b94ad6147f1223dc4a270fb3 SHA-256: a83ed0a66daf1b5bd9c22b0e36f7c9400f332d92ee1bedde46da07fea24efc09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fbcbb70c47e2c05bf6f0d54e1d4c898/91160116388.pdf In PDF document text
    • http://clubselectionvoyages.com/images/file/fewuti.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2f8c6143eb86e5966d4d20247353bbac/45169989424.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a3f2902857675b4a4d0e853379930a8e/6711402862.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db4d47d4e39---18171901698.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/tujamuzarisa.pdfIn PDF document text
    • https://laser123.com/geektic/files/pisobuxo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd37f0c93dc8c3bb5c431c3e39b2cc9a/jokivaralomunuzenaga.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa227700e64---30397065070.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/welavizebojonozujiwi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8790c674771e700ec83b1641b3b25e08/79711823321.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/joxipex.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-3/20210703201539916086.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zasuvone.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/13311599262.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/funonenamasejexokutixu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb49070560---kulovelinupifusi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/t6gr1qcsje1jb2uq6c0kj1ftlq/jekesot.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8d65dee8b---27534301593.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4jklaqclm0fi19dkv94t1bo845/lemufuwasatiboxivadej.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n9u3k6tjl27903qr5vdopv2t06/keluwade.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/91171284284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=como+obtener+mi+rfc+en+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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 14492 bytes
SHA-256: 18f073dc74d7baf4c5fc58af8bc58f9a5e84c7c5bc11f13eb6ab4a98c35a38db
font_02_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 10576 bytes
SHA-256: 17f6f1e3fcc88a8aabf94b49d2a74c5aee837463a35075e5cb22b49713de8125

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