Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b4aaf4ac7a1a3f…

MALICIOUS

PDF

84.5 KB Created: 2021-08-20 00:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82157c7fe223e94d92ff7eaa9fcbd7b4 SHA-1: 15e57c2c2cce90db58b5da9d3a3e784d99ade823 SHA-256: e3b4aaf4ac7a1a3fae49880a7dd554184cbc9f0b3b31da81f633703068a24d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ketchas.ru/uplcv?utm_term=download+my+talking+tom+2+mod+apk+for+android+%28latest+version%29
    • http://amandamaitland.com/images/file/47518659094.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/27ce2f3885ede07781ef75c971db38c9/zufaroturo.pdf
    • https://annjulieskarpmo.com/userfiles/file/40705273264.pdf
    • http://suphammamnon.org/uploads/files/gexikowalipam.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozuxabexaduduzuman.pdf
    • http://regmac.net/userfiles/files/tibidodajamomusuz.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ggpfccc204i7sflr9ogcs4eci6/24728549736.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ci302amru02rk86b7rig5draro/96712699943.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d73e476a---48721475793.pdf
    • https://siangyun.com/upfiles/editor/files/42930919406.pdf
    • https://eccdc.org/application/webroot/userfiles/file/jirujawadogonabobaxe.pdf
    • http://birzebbugastpetersfc.com/files/file/29926441065.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u638rnktu0jah242i8cihhjon5/zedal.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/80385347267.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adac5050473---bipivufadusu.pdf
    • http://domeinbeverdonk.be/assets/files/file/fujedubefiloredazi.pdf
    • https://gkscam.com/userfiles/file/zutekak.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d29e37474---1519837505.pdf
    • http://huntland.hu/upload/file/xoluwodapu.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2c0ee49e---82767021336.pdf
    • http://bayernglobal.de/userVZ//file/divavanawoz.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r1fmuck69mtgt1kltfpceql3tk/kogigoxaxatipisogawirok.pdf
    • http://ekolojikweb.net/upld/userfiles/file/vubibuf.pdf
    • http://sys-svinding.dk/userfiles/file/74491898543.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e239.bin
4d4039649d7cdef54dd2da7f92ca5fac474f9ef8e9d8a0b783e4ce01a7997005
pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 17312 bytes
font_01_sfnt_off00010f50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 16792 bytes
font_02_sfnt_off00012767.bin
0b5dfdce0d2e66ef7d35f5ddf20e065d69f667ce0296a504ad0b59187c142a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 11476 bytes