Malicious PDF — malware analysis report

Static analysis result for SHA-256 faea048202c65f27…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 01:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b571cef79b288167d035a6a3868fc883 SHA-1: 2a29fceded3397077214acb4d6d8b79483461376 SHA-256: faea048202c65f27ec859b95cc871347b0678b58785eac6a7e4b07e335c77ff1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using dynamically generated URLs on potentially untrusted domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ce97974c---78786392515.pdf In PDF document text
    • http://dentistturkey.com/image/files/56528575594.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625556263.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/nepinuwetevi.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/56750456061.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/38846238052.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/kaloxonabut.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10922500cf---fisusasurakigazejobaropix.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/zudaraxexaxisulivuxila.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/88654627355.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nufiwezamivalanuwof.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kevuviradupiwetagida.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/11481743673.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210721_CFF2E9AC386AC1D8.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fejininejutopimelozi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9i4dfe6t5abkmj4hjrn4ena3q3/jimugojug.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/9741eee3c029236fc3035394257ab67d/67304289891.pdfIn PDF document text
    • http://ahchala.com/img/file/30565424175.pdfIn PDF document text
    • http://seritour.com/rsm/files/21607053145.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5dfb2hom3mrmhjue15gtee219/lefetitomuvududom.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/37bfdf9ad820198aae25b69d07a26c04/rikurefotobakexuwisotudub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=leave+in+conditioner+makes+hair+stiffPDF 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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10812 bytes
SHA-256: abd6f320d906447726732b8a2449461efa6789a599cd05cbaa5c0e175c14ffcf
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 18196 bytes
SHA-256: a615f367c8135ce2342e78517ab913cea00f7af0d4e85e40777ddde6cced92a2

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