Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c926f1778fffe6…

MALICIOUS

PDF

120.9 KB Created: 2021-07-24 08:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc718a3b1bade14b9e11bb5702224e03 SHA-1: 746cafe2a130bceec4c46d9d88eb9ea8e3e60635 SHA-256: 35c926f1778fffe6ecb0356db32f8b51a2423df67028a2061a2339d887f89f85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://youngshiny.com/userfiles/file/1622372943.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/951d187ddab937459207e756f46c4f1f/68589492583.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e308d912a---33126843218.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0b31e3406fa59863615b7afd551241b1/fapesox.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/suxewuliwunuw.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kkh897el6kl0dn6lpqbntavp04/bepes.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aad658t26ul821ujfth6gfor72/xinasawu.pdfIn PDF document text
    • http://malifer.hu/upload/file/85082463183.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160869125e793d---sataxef.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5927c0cd4---76415711243.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93317708200.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/mubukerekasibijirug.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23f89ffc8---30218128084.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/luwerasidapopikodosusuzoj.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/boxebuxovaxudoxadoliso.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210704_CB67409117F0672A.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/92379655899.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/55799000645.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160894d365a80a---67715805252.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2084b8ea15c3d929df9edc617562ee4a/19753541725.pdfIn PDF document text
    • https://actorconseil.com/files/file/xuzopor.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/25b448b9a1035adb7ae136bf79d25c62/94300311440.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/88234790875.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/rg4k6t4gi7bk6arjdfg518ouh3/pebudobonadumosega.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a6cf7ac25fe675860e1dfbc2b0345c3b/58711007731.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a8c47167---49053230890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=analisis+sintactico+de+una+oracion+onlinePDF 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_off00017442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17442 10444 bytes
SHA-256: 63471ee7431225fd5fec6f0b21dd25e8ec373be659ca8aa00d8e292d5418d420
font_01_sfnt_off00018c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C1A 18632 bytes
SHA-256: e9660b2570face599ac0dee56ee63ea29956a6f7655e52fd29b6d7317d1e54a6
font_02_sfnt_off0001bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1