Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b27cd1f542877…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 20:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82f5ede2a928b7c391e56ff8f33a709a SHA-1: c708ec7f5e6fb3a73961839eaec3a4fe38a4d09d SHA-256: c98b27cd1f5428773677d6a9dfb46fc41447a8a35960f4ff040eaa203fd26c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=firestick+lite+downloader PDF link annotation
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ef1ce6f67dfc0d623bd33aa99dcf9775/84145508124.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/tugutogiwudegexiw.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/xoropunibananobetizasebop.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d1717e350b04ef21fdf4c317e4bce2ff/fokelofomafepugolomaz.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kewunugolajuvukajoxava.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/8742541340.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/490c38fe99fed0406850677f7d5d6b89/79283940976.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/woxif.pdfIn PDF document text
    • https://x-software.cz/data/file/pusasoxoduvusunixideveru.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/39678428209.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/davotilasimifemobisuvo.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/34280300710.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/91730184636.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/deziko.pdfIn PDF document text
    • http://ombs.ru/uploads/files/63631466545.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/arjg2l759bobislccmjvbe3v9i/sejosepixudopodite.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///79686970059.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfed70112---9776246762.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/robapukeposikav.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/49989853143.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/wapekap.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/20503379285.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/98264819703.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jebavigixi.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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 17400 bytes
SHA-256: 6a593dd09c8f69dc7a0661b24a14ef48876fd6fa747322c9d03097b6d1d3371a
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 10520 bytes
SHA-256: ab5825c4d81c0b52d03e2dd0a902884c29464cb478ae9a00c6adbc27c457dfc1

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