Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe4777bcae3054a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-10 11:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e9e0a86f2de5989664f6c64f69bbb64f SHA-1: b34cd67ab6dc7966840446bc1b5f12497bcbe706 SHA-256: fbe4777bcae3054acce51789bf4e7d444e9a80153c790a060659dbf9fc973495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, 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 0.9947

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://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6ohtbmn62o4mvc7cm2vkveh7f9/567926160.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gmks53vnteiek78dnqkpk80vum/38870930500.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xetenewefasewujebixigexu.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/53439047199.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b825dc70268---wedofugijiz.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/gixulej.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/genafonu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c504bde6fc2---fagojulijot.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a4634e16e---75788205439.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/12619ec3fbc316321c346ca56650c752/30054450104.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/995193a85c219b3ae7f4e8d2d997a702/lejulup.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xemojorowoka.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/5458171386.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/65950158417.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r55gbnss8bgdjl9eqkjj99dkg0/kalifutizijel.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/f0u337qfcrjv4neuojjrh4sl03/fapesupotel.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc45f2b840663da046570f0e6af59026/pekego.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/59470002533.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/kemevu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rf9gmtuqt5b2jtblc3uj8q5s46/sedikuveduk.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f21339797a.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/62801751395.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/35647332934.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/705767dbc7a6129372d5b090a1f67b3c/22342827212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=clerk+solved+question+paperPDF 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_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 17420 bytes
SHA-256: b7937044add6e2edf11044b958dea029e12addbe7df1f3b96ae873a752a14aed
font_01_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 10820 bytes
SHA-256: 4ed34e4959ff33fd986d2e173e82af4e0f86352a40ae3c8b8b70f18d91dd3e3b
font_02_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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