Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ce2d149729efeb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8321efca997af4badab22b3418165f7 SHA-1: 882a0030dbc738a02afc068a65de9ff74143052b SHA-256: b7ce2d149729efebbbc751a979b03d78aa8fc9027df344b249942a0198b77141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple external URIs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of numerous URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=pokemon+randomizer+game+online PDF link annotation
    • http://lejonhund.com/upload/mosob.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109061443194271.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kekedeporamuzuzisar.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/worosukogamezudupi.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/fafidij.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/59882843386.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/74393543405.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/7291577218.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/deruxupolidonaponesejumu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4963298a7fc43288c0cbd8479bf4a87f/movawonowesotax.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/87611097983.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d6496eace0fd91045f3accd6e47b71e5/joxetodew.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162943237e---wekudajolexazewokud.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/55014565739.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/99230375792.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/tepomojowalapodewiv.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/vumeloxutojoti.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/72336163604.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/75097842709.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/vigukofozezodimewo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jadifixuni.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/vesasigirofimomixetuxiv.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614814986326f---68028197227.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/zokizorejeb.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/38353520415.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/radiniliwasawofevotipukej.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 17172 bytes
SHA-256: ba47a059d55dcae80ae16afd7c57aab98424c9b5b1f86bf49b15ed3948412d2a
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 10476 bytes
SHA-256: 60c1cd13fe6b1df5f1bf5c20294edfa29b2bf52d86230ea6f1aa4f05bff1e43f
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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