Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca922c9f73a131fa…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 07:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7ce3040ba81018fbc3a3cd87b08d0dd SHA-1: 7f070d2574623ff4e1e75cabd80fd23f5f0cc7a7 SHA-256: ca922c9f73a131fab87cf26fd09537db157c94c7e9949a50e1d9d5e08b1280f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://veszpremlizards.hu/_user/file/pubuzogavitox.pdf
    • https://dusunceokulu.net/resimler/files/4199513420.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae2461b41---totamewuluvabesi.pdf
    • https://sealand-pptc.com/userfiles/file/81869504422.pdf
    • http://louisamerino.com/userfiles/file/pepitaripagefikifor.pdf
    • http://bajcsidavidfoto.com/_user/file/16475144898.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a4dbe8ee---xagowa.pdf
    • http://didaconcept.com/admin/fckeditor/file/punudupisugofowu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9c867b6314d0a15dae474b085c93eec4/pumokusigomevenuzi.pdf
    • https://vnnc.vn/img-hdmedia/files/30776663411.pdf
    • https://tarzminder.com/resimler/files/22173197799.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387c5997cf8---14453072520.pdf
    • http://www.39koratmachinery.com/file_upload/files/nerepeforipunilagaxa.pdf
    • http://joy05.com/_UploadFile/Images/file/someduk.pdf
    • https://hongming-eco.com/userfiles/file/69345540406.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/dakovet.pdf
    • http://crosswaysrecruitment.com/userfiles/file/wenegopamonetodibife.pdf
    • http://infosierra.es/images/editor/tabapuwulefetu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a63e2440---55178787412.pdf
    • https://clearpatth.com/userfiles/file/75959377318.pdf
    • http://usaoxin.com/userfiles/2021-9/file/tapikep.pdf
    • https://saigonservices.vn/images/uploads/files/57970914892.pdf
    • http://uzks.hr/upload/datoteke/mimov.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161423d037b5a7---80919396447.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+book+of+enoch+free+pdf+download
    • 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_off0000ea17.bin
64f598b3dded1f7a0b76ec95d672cefb14eea85c5c92d61126df42e261fa1fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 18960 bytes
font_01_sfnt_off00011b22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 16792 bytes
font_02_sfnt_off00013339.bin
1a934a8d3f914d42bbf9e3199bff638bff4cbe75088aafebd7a60c07f6cebf84
pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 10640 bytes