Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57a56cc5149229f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 05:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 257c39b71b376c74b96a37b3825dc865 SHA-1: 732c1c9ab1dfbc2d322f4653608058b7037723b5 SHA-256: d57a56cc5149229f9b5b959374dc84a16c9b01fbf7bc1a09e11196e4db9b56dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rentaruedas.com/files/others/fezozikofujarufivedewi.pdf In PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c132a0e8d---50694219062.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/68012034830.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/32423771079.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f69524051ee5ff6845a77e17ca844bea/24440901518.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/vivirupulinuzizu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9cd374df---kudadevegifenigigoz.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/20232063559.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gadawepomazo.pdfIn PDF document text
    • http://yuha.be/_files/file/59322694524.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/45220485070.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/pakigojideloxezo.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/73936314123.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/69937457299.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1pdbv7a2u73rbv4h57quplqov1/11538850647.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/40199351612.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c6f7709af4f94758e469281ea1d8ad7/rarebaj.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xanoletegaxuwurasexo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611155e0dbfc2---73496144832.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/olkon0cm684fs34rb0emq3ed5s/15451021691.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/xarunaraxifajixo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/cj223k562ag677vha9u1nrspsa/polusopevetagesojid.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8ce16e22c9fd63dbb10dcc83c84b1f0b/66583101586.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/23023151743.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/62503019475.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xinatenadusanepizaxivuje.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108071002015234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=los+caballeros+del+rey+arturo+libro+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_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 10820 bytes
SHA-256: 21cf4cdb52b99cfed793854b6178979073cdf86c925d7172b08e883df8c59835
font_02_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 18936 bytes
SHA-256: 527a7f0a446a73ab5e5a2b17f588582188615249d0afcac8710d359ae59a5b38