Malicious PDF — malware analysis report

Static analysis result for SHA-256 99403995c29122c3…

MALICIOUS

PDF

87.2 KB Created: 2021-08-16 02:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a6161371ec1d63faa6050746347c401 SHA-1: c22dc64aae2274f560c337703b815473db2256dd SHA-256: 99403995c29122c3f7c3c96c1eee221c752079b3fb660ae8a196af0efab7b88e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ade671d6b45---76823195743.pdf In PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/15523714298.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/6421473681.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b99d092ce---46622156220.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/latojagiwuvikexugutaret.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f08a2c2dc4cabaa39bb13e11e2960139/66632385328.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076243719f2a---88080166894.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/wupufarikokenomo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6582f332fd3b0735f4ada57992f34c01/60900469631.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e5da5c4d291aa056a8d23de5ad4b64e7/jotiriwebexisefoke.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161097a95f2e84---24680970776.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/65727162781.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/badurajipunogibizof.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/21280756621.pdfIn PDF document text
    • http://biomehl.com/images/content/files/lasesadotekiwo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/razukalageti.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161077770c2efe---83477703386.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vutubowitabudepinil.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/01e036c8e3d1e7462ea37122435a23ee/8002349817.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/30oavt2haab5aupchc17m3rppl/fowezawobidudigesopo.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/55027673746.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/gopatosorez.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/064b6693f0be64d77b3bce8899c13d00/90374113740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+money+glitch+online+2021PDF 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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 17312 bytes
SHA-256: 31de2877b4a249b10068c9622b4c9f95e39bf1e9cb7935f4baa2e1b699eb3d4e
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 10856 bytes
SHA-256: abbb7ba8cefab13f7b447d5a4620c0f184f61e3e12d862b87142e12cd1959a42
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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