Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f36ebc22dad1a3…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 04:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0f66b7f1838cf05e821047a645652a1 SHA-1: 106ac30190603c1e91801641c6fae2d9ebecf508 SHA-256: 16f36ebc22dad1a361d9f75835f9d5921053891f43fbcd70749f2c1dd16336cf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm designed for SEO manipulation, likely to redirect users to malicious content or downloads. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=pro+apps+for+android+apk PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614092bb42e69---sesufurufatofilojopa.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/7181141980.pdfIn PDF document text
    • http://lejonhund.com/upload/xigexonikidir.pdfIn PDF document text
    • https://icbacademy.com/upload/files/tekitur.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lowidemalurusukupa.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/regawalivodovizofur.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/nagomupexakewekesasafufaw.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091111511573499.pdfIn PDF document text
    • http://amdind.com/userfiles/file/36162657878.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/mewozuwomomebagabebaga.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65079778509.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/kurazosumajunuxavumu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/73781e3e2ba9a8230d9683b0dd4c757f/satop.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/64752590605.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614097a9eaf9d---fedanokokiluduji.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/55499574140.pdfIn PDF document text
    • https://kawanmto.org/contents/files/75124528880.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/38911845680.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/tabejibevadadiberakado.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jusajedutitapuv.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furipov.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2fc77d240ace4df75a0f2aa270e1c41c/falojenif.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jupukosalovakoruja.pdfIn PDF document text
    • 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_off0000c216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC216 18956 bytes
SHA-256: c5de528f7e2944f95c5afb405128589ead447bc4f86ccbe12d74c507b8ef3bf7
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10308 bytes
SHA-256: f0bcf0a13d6d681ad63e2a7dc06a802638017cec567cffe3d1aa3b13a6dc5ed9
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.