Malicious PDF — malware analysis report

Static analysis result for SHA-256 b085c7f222962385…

MALICIOUS

PDF

70.6 KB Created: 2021-09-01 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab032cd8bd38dfc674c1b3bb40739c13 SHA-1: df77c665d8c660fbfdefa16c67fb4a59140f4df3 SHA-256: b085c7f2229623851c089b1565e5210778bdb12937e17776895ae4bde06e2f41
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised WordPress sites. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://editionsitaliques.com/userfiles/file/nipukiviwexitoruji.pdf In PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/39941779978.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/81073245403.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/vuzirenumapikabadoneja.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/39337119118.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2180586a5---nubijopigawumarevimo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c0a15daf8efad6abb6bdead4e025e06a/fojimelesowagowenovibu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/katasi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607483e1e7f8c---semomirorojojilukinupisot.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/29f3b6ccfd80d17df565ba64f429fdea/fobetudowevitosevoke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d2da3bc3---niwomolifojujapezu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3a179de32de44c71614db6e694f095cf/72807753382.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/98d3c19ea54976607f71facd06d59ac8/50558481550.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/78609365918.pdfIn PDF document text
    • https://ebooksweb.net/files/file/71775198189.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/35647332934.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/66073771409.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/19231734067.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/tavorasuzujimuzemojas.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/zujaponavovof.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/426e01c1052ac97c151551ac5a32d070/tilefosiw.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/e4n4jq8nnaa6u5gjhvnefr8s97/55531691.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f2853a664---42727710732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=exact+value+of+trig+functionPDF 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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 10592 bytes
SHA-256: af11ff0734ab42eedbde5e36468fc31cd6e6baf2c16725fa3a6b27f369c23b76
font_01_sfnt_off0000d085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 14488 bytes
SHA-256: aaa82e53bce155bf66c14d738d3b14abbc95d0e405855a333eef823726c54dff