Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ca52bd59f3bd84…

MALICIOUS

PDF

94.9 KB Created: 2021-07-17 12:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07749cdb38dad425bb30af1d6f9a7263 SHA-1: aa2d64ef6e8bc7d960fd6484e08c46a32ecaffb8 SHA-256: 33ca52bd59f3bd84d108a2f3e4564e73898d1ca417300cfcce2825675dc290fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2524bc3c01bcd96626426cc2adc21ef1/sesara.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/77500689825.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2fe8ee19c6ef5c0d2c835b114e1a451a/29898071235.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/wenexewedisevibelup.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55383800072.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kgvl640h7p4mst6rna9uqp1dc4/74371022102.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/zigawalavuxo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079a62b5dce6---kisifubobiroropelo.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/wutenedenazedute.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607813cd03b19---72012887174.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5gq4cdmo9i1jq1btf75jtq56vf/78760726636.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/37865223818.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/10986374148.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/fufinedasumumepomokibud.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kuximewedofomaz.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/78212351768.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a57b1321f---banipaf.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03e9b122e---tisizo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c215ac57c---jawod.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5841bf92d---dalamaxeragijokumizepapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=said+to+change+in+indirect+speechPDF 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_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 26308 bytes
SHA-256: 2450ba27b0984b67aa4dc7d2b99e0591994767ee1e3c5e17b50e4c33cbda46a5
font_01_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 10824 bytes
SHA-256: 33f17f9d985449e54eadfae9b8999b03bdba8ce83c3f8391d697757f43e92f5e
font_02_sfnt_off000156c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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