Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5539354c3dbf7ec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 18:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2e4aba7599763eeb981217514d5486f SHA-1: 9ac80fa3f2bd2ab26d30b745c72b05239e897318 SHA-256: c5539354c3dbf7ec72eb055cb168b4922a882150250c075bef72bd8faef35690
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. No scripts were extracted, but the PDF structure and embedded links point towards a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nestaerospace.com/uploads/file/dotabakexozipodoroke.pdf In PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/13383817687.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/jafubomogowulutisefepim.pdfIn PDF document text
    • http://erdbau-rauch.at/maketuf.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e764170a8064db71f9ee4f6f535d4b10/36582980213.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/nomudifewaxalogok.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130746140d87---tumebizositurupipawekoz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2a984c1316b42fbe867196cf11ee8de8/11677487025.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/wumuwusorenabu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991b9b4a63---mupokixaj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd58353405b081b56808fec86227ad4f/35919382654.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/gilixizatibigujikeloko.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/gajobadidezorekimana.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a15d069d2---39580585413.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qqvobq6k90a7h619hh7vj8r9kf/zusesumoditiju.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/mopuxoxapofef.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xofedokezag.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fokanigupifudadesitat.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/bejiwekimiwafu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5392572b830b6f28c50c35ad3d5ba049/wenovexu.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/72170638667.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091733d6d721---rudowebijuvarewomatex.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/11abb1e9c80c46b1fef27eab05700d03/damevenonix.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/16976822585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kuk+revaluation+form+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_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 18208 bytes
SHA-256: fb442ade95e67ccac066ffd4f9d69bfe52449c2dfe1d25160dc62b70af5a4b50
font_02_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 10740 bytes
SHA-256: 2a1467502c2c10909d28203d6b2acca4ac05890e21ae67f8a1cb92120187cd54

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