Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8df4a0b20e81ff…

MALICIOUS

PDF

82.4 KB Created: 2021-10-05 11:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53f153d25e8f0d5ca0fad47a38fa977b SHA-1: e09f0ca9dcdfd0e74bebb6f0cdee69ac9681a988 SHA-256: 8c8df4a0b20e81ff6411a280148b96cde90dcc309b18a8d27006ef5eb4ed35bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=spring+of+life+meaning PDF link annotation
    • https://casasholidays.com/scgtest/team-explore/uploads/files/bekosofafogixomogejatob.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/datowavuminaf.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/powuziwajuzonatasafa.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/69395501705.pdfIn PDF document text
    • http://ahchala.com/img/file/gisomokokujeweletaw.pdfIn PDF document text
    • http://soles2walk.cz/data/file/tivepugexajamuliwepibofop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409af80c574---66255246105.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b6494608c517720b4137fba80fbcdeaa/ximumesatewenukolatabi.pdfIn PDF document text
    • http://yjccnc.com/upload/files/27164400440.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/bogejegetutasefetexunajo.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/3366715071.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/u5uc9qs8015ahblo4vtv7huuj7/domusik.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/jupizokesoravix.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/77668975768.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/vojuko.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/84138328532.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/29162569309.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149b93844a55---kemuzerigagagulalusotitaz.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6a482dbdc978e4165cbd4e28c50d1e6c/vemifutojakezi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902084841.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/gupififibut.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/wugofu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/vuxolizunipijixalape.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xarapodatamot.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/dovesaxuwotikexugipatiz.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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 19016 bytes
SHA-256: a5c62c4405555e8a553a924dd4563115ff4c883d64c8b728784d47cdeb60611e
font_01_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 10512 bytes
SHA-256: 5d7d7fa937942daa2a349a5b4ecc4c88c8f435ad0f2104664f0f1436dafecc0b