Malicious PDF — malware analysis report

Static analysis result for SHA-256 9159c5f92ce3aa65…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 07:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 077e18e8fb543630ca9011ea7168643a SHA-1: c50629bc34f464f0e9edae4e4826f3e54b173ec1 SHA-256: 9159c5f92ce3aa65ef4de16a5c56a0d562e7e6caf86938ef1f5011c9c507f19b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://supermarketdv.ru/files/file/foxodekajoxuzaroxemesabol.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/66863806473.pdf
    • https://fedico.ca/upload/editor/file/90915327210.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d129a424---11486296822.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef377bb4c2---31065449666.pdf
    • http://kashima.cc/userfiles/file/75888085276.pdf
    • http://anhbanglaw.com/userfiles/file/gavodugalegegajituf.pdf
    • http://palami.by/images/file/307912604.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d93d27dc5---10318540156.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d3b6e3c2aec75acbcd08921e10161e17/353798367.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ggckutimf16t1d0rlntnup7fce/wazuburitabupupidiwaji.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/fakutipiguwepez.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3aa232533---97049022608.pdf
    • http://bright-inter.com/file_media/file_image/file/92268899377.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/nekevedapekavupujikujipuv.pdf
    • http://changdahk.com/upload/tokatewudufamir.pdf
    • http://cariboohose.com/userfiles/file/54739521963.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b457a29967f---vawinibosaxidaga.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a3d3b257---85286808413.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ea25db3182410c6b5ead5aa7a1d234a2/99578629158.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608881d04be42---13013188960.pdf
    • https://hostmegasoft.com/calisma2/files/uploads/kaludiwarixududibasane.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ascension+wow+realms
    • 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_off0000f157.bin
30b07dacd232922e00f7f167d8bd2eb7d4a9affc968129b8c5a82ec0299c0445
pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10360 bytes
font_01_sfnt_off000108ca.bin
e9aea248b47860ae9c2af7533958d844fef4258ddc94de0005c1147c5dc33184
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 17376 bytes
font_02_sfnt_off000135ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 16792 bytes