Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b82aa8b2174c3a…

MALICIOUS

PDF

99.9 KB Created: 2021-08-04 16:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7b87eacc5d4aac0170562ca35580ce2f SHA-1: 27d179e0ec71ab05b4324bd43d7cf5f72b33d79d SHA-256: f7b82aa8b2174c3a2157c86f92dd04ba32ff38534e26173e69f4384e46499ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to disposable hosting or compromised CMS upload directories, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://castanienfamily.com/clients/74558/File/33938287790.pdf In PDF document text
    • http://ttmplus.com/userfiles/files/tupizumedibapajajigu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/waxejaku.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/1456148300.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zorakojon.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a3be52f0---sagubowabe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f413b2a154---sedizofitiruvovomujal.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/pukisesan.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/jipevifatamot.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/12984081677.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1754cea8e9---xuxopuvitojiwo.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/69806033598.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/53252091090.pdfIn PDF document text
    • https://ridersshop.it/file/44251241621.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160958d7e0d6fb---rinurubitazijavisugezugo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/13f44359721e278e962b3a4d993778c3/nodexexigefaluxelu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/19169034992.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/siramuj.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/3718156267.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4085ce82c26f837f25d13aa5941e726f/22527314301.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608082f7c8fbd---powuzotazinu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/wutaga.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f10c94db---740274718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=unfallbericht+schreiben+klasse+6+arbeitsbl%C3%A4tter+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_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 11260 bytes
SHA-256: df4eafa305f62ad4eaa78bde6c1cfd00a1fe6e5bc2749db433d7800ff19e9edf
font_01_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 20100 bytes
SHA-256: 7563c4eb3733f3c8c95e5376a20b589074cdadd62af38ee37905e28f0c5c8fe9
font_02_sfnt_off000166a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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