Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce65af1fad00a99…

MALICIOUS

PDF

81.4 KB Created: 2021-08-18 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 947ef8a5a1ba15416b19e203b08b9df2 SHA-1: bcf30ee914449d4a86f3dd945fb9ea0876b7aeee SHA-256: fce65af1fad00a99ebf7ff903cb1f9ebcd9d26d96c8c1b34021b7b38e86d9e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

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 https://huntic.ru/uplcv?utm_term=to+kill+a+mockingbird+chapter+5+audiobook PDF link annotation
    • http://ebrinteractive.com/userfiles/file/kerulepevuriribazibumok.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef189b770551a8bf5ba908cac4527fcf/kinovutazisuxoli.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7516071ad5---jojipowuxosirimaxuvojijud.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/sunokopamu.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/26929821288.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/4196768087.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sujowuvegenuma.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/rivukumavulilepobedi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98d549206---luvifuwosupezetage.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/ketamejemirasenodovo.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/galarawijapasopize.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/43e69c977d51bda06118b7897aaae379/92841632114.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/63756114460.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4eba5071d---duxulanazezuwugaza.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/93310970177.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/joruwuzubilisojuwodawipof.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c7tn7k153m6ig8qoei0fn0nvv4/73187691289.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/xivitasoworexupo.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/sojefipakivemexopawiba.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/fobuvesowinarelosiboj.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9e67837c8fbe398b5acda2a0b7010742/fisutofuzerojuvagem.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7877542748ec08e010f478f92a39cf83/birovotexexedefagowexewis.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/49084364952.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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 19044 bytes
SHA-256: 3d93ff7f835a303addf193d8fc1819ac460296595a719027e19c9e154473cd87
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 11220 bytes
SHA-256: 92eb69489b41dee6edf2f3e6cc64d3ba41a9df5ef7a76e622fa19aeee27e0344

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