Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b03d1a4a0f4862…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 13:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e48a4e40c4202b64ac7660872c86a32 SHA-1: 775b532a8decd03631a17e5a9f845b804a8e1d3c SHA-256: d7b03d1a4a0f48627fd7421ca4cbd8c9f179a9fa72270a1ce6851a94b730bf91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. This indicates a link farm designed to lure users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://gatewayhotelbangkok.com/upfile_hotel/files/62697131113.pdf In PDF document text
    • http://ahknchem.com/upload/files/42300254969.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/82800111244.pdfIn PDF document text
    • http://szjg.hu/images/file/wazazon.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/bilodozimim.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/nojufoti.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/mozimevikameravur.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/pivuki.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/43725335218.pdfIn PDF document text
    • https://goodline.by/userfiles/file/47022817505.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_074344.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/75812458919.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pagemenunuzav.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pd034i211gcbd9aqqv9d0ipmg4/57524159435.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/78289523606.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xejamesixokarimifepap.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/talitufefakolumosigu.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/kajiveranonajelukebiser.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c19f71e3904f58917f3a024b47dbaa0e/kebujosigag.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/29334651433.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/nolipibuxipej.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/kawaxavewozupuwusezaseg.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u89rap5ehdpvro8p4jvqv33404/46889034578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=8+ball+pool+hack+long+line+apk+latest+versionPDF 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_off0000b40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40E 17420 bytes
SHA-256: 061767cf4dcc1be8dc775d32276123ee837857d71cb7a335af60140574a978d9
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 11060 bytes
SHA-256: 35d83587287cc50934bb385756391f3ee0cbe94936139766d5de3dd5bbdc5b3b