Malicious PDF — malware analysis report

Static analysis result for SHA-256 663253f2561e8503…

MALICIOUS

PDF

87.7 KB Created: 2021-08-09 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e52d5ad44f80eba62f4137a5e73d57c SHA-1: a6500b9534773eb55ab35309905920a0dec3508f SHA-256: 663253f2561e8503a947ab9db5ba5e92e1b0e5f982541a86b2c35c213a50e878
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and the ML classifier assigned a high probability of maliciousness. Static analysis revealed the document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3841avgse6psj6l1jd7ku17t4/xowifezuverikipajaxu.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6aacbf11dd0655a79267ac9d430bd8f0/46318582503.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/75889106250.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dowubixofemumubixasapoj.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/2c162206edbdfa682d391405e74d3826/19926772187.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20f60cea1d---61769126881.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/e7f5co2h0v17011e2iuaie0u2q/dodubejika.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/kewezudefi.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xululus.pdfIn PDF document text
    • https://wsbtitan.com/images/file/bopawidibapusinomaku.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b3cb0f86aa43bc62b95577a11f7ced38/nesineke.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b807af0e8d5254d9e40233f2bce83a1d/24353880817.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/tegiwobapikokafe.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/31875027391.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade2db6ab94---38310576307.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/36129258282.pdfIn PDF document text
    • https://alutat.com/data/file/wimejilexelidonowusanusu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bfa9eab6e1f5d9e5c8fe5dce5c741201/gimadeboji.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vewofujaloronewidik.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/2614298401.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8bdd8b096---bugugezudezajidigepari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+limiting+reactant+and+percent+yieldPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 10984 bytes
SHA-256: 5f5fb0f99c443275998b7c990af844dbd2391e2867fabe751882a8b5bbdfe77e
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 17568 bytes
SHA-256: c4fb547c58af92281543b01f58e052bb2310122a1f6e1288784b3294c668fcdc
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off000138eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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