Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5466291e077cd7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 01:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a64131f676f3a10c6b325926b9e2ade6 SHA-1: 34b2d7dbaaa46b13d723c56fa5ee8006a846bdda SHA-256: 4d5466291e077cd7f7d9bf56325cf86752ad4dda4cea5124067053dd3f71da2d
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_URI heuristics and the compromised CMS upload link farm indicate a pattern of distributing malicious content through various web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dui-antidote.net/images/userfiles/file/35630466842.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mu28fh9245rvrf673nglkntl0c/46211395216.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210813_062849.pdfPDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce66066bc---12830552274.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/movofafagi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/78497376511.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/pumive.pdfIn PDF document text
    • http://balone.net/_upload/file///nefajoro.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a69b40b7b49afc58c9ccf5471ae1bca3/fokubudanig.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7g8k9vlj8a5gtpp234hjgp91qk/fakuritikotuvikemized.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/tabazove.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/63786869160.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/82283533773.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kqefi3q2b565hb53c72cdtpqea/41252465461.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf51f59a4d---jidune.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a3843ab83554c6018b645351ecb47588/zitokudekemajiw.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/noxatigijodorisevol.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/555546b960c1099c5f4f77a69838a0ce/rotugorurutibexoza.pdfIn PDF document text
    • https://panama4d.com/contents//files/67877255543.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e93d52efc---xelajasaxaxe.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6bc16a7ac9945469aef2c1596aec51c9/21725348428.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/14179161523.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/85126841635.pdfIn PDF document text
    • http://nenorm.com/files/files/3248525549.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/19157331336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=speed+automatic+transmissionPDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 16920 bytes
SHA-256: a83e2f0077221623d4827a89e0ed2072dff47eb0b3091a66d9eba2670f41aebf
font_01_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 10804 bytes
SHA-256: 28176b596931629c2dae5ec3833f92bd41e28f8b8cbcc151822ce8ab2c5e223a

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