Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cc828d975dc23e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 03:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42ff88b336ce2c7eebf294e2419bf5be SHA-1: 452f13fbc4a472dc161bf83213b814302b8b5e36 SHA-256: 46cc828d975dc23e61abd4d4f8a16a7393f8368d5db86f6dabdae31a3f4817ed
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=wear+os+file+manager PDF link annotation
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/s7uj8e93qvtcm4bgnta4jr93n1/62412608676.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bapunusinogorej.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135928c896a2---bepipozopudimoreroti.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/letosazavakax.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/96492147561.pdfIn PDF document text
    • http://voijin.com/userfiles/files/jewidapumixa.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/kusojob.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/85409478048.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/6233246457.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/jazesaviwufavenurafetoro.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/7336419787.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/89724553930.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/52910967785.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/18371996595.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/ferogosavexutidegew.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bccbe870---leveroleboxerusowozen.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/daperokerutonefiripa.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/15650475639.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27543713518.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908002624.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74253481120.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/423060fb6095bcffd4d7c1aeaa3005ca/wizujavabesajilevonaxomo.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/36245698855.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/13438368281.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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 14488 bytes
SHA-256: 898d12d54edbfa0625eab5a5990a1925eb8fc2d4aeaa63c8edf82dc89e923da0
font_01_sfnt_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10452 bytes
SHA-256: 74a659b729f423720655cf7031143900b21cfc68754614a17984dab4233a7c39