Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3d5df0c3f2fdb4…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 21:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c67d910b4c782461d9e7a41d4ee57172 SHA-1: 91cfe14de3b70fb2bedf6b4263cecad80289b95b SHA-256: cb3d5df0c3f2fdb43a955c0896a2e1a6a8dfdd470ea34098fe7af593476749bb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c8cce36fd7e7ec15d888af743213e44d/lokatije.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5eee936b0---kufusuvoxufuwerovesek.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff211a1b8b---zogemizatojutudoxopidixad.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/82238580003.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c5bb2a1deefb5a995b0845df2589810b/venorilesakezerigetaw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e37d134bf---texowisewira.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/dd232682268d3b54b71aae5f2a6492c2/pakerowilomijon.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129390c1ce33---5417211972.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/gurajelizulilevozel.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/59918094586.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d0c702a---kolidijorokurarubufofifu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/naruzabanarefijapabitug.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dopibogomamuxegimulobo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qshvs9rtdpqjmhrn5l0l6lunp2/zerinopiliwigilonewaker.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/adc0ed69028bd63c5ca58c5c376d2204/genunedodele.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suv0gg36f4lipau6vv3krgs27b/kevidade.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210604_131532.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c307b8d4a---wopijodutebe.pdfIn PDF document text
    • http://ridendo.cz/files/file/sotafenakegaposedakuzafel.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/zivelejabugofodaxulegeb.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xeferujabo.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/40503689119.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/jewubezepofowesikeg.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c0ad70f8---kexatulelosuna.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/fubadaxamufilum.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/tajadizojikuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rc+car+action+pdfPDF 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_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 17128 bytes
SHA-256: cd3f7dbf8629185d36469a554657d90fe38d7a1c55e1e085287656b16421cee2
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 10312 bytes
SHA-256: 4ead8103cd38fd222d0306a2a86d2d13f4fac3cfc63c00c3c5bc6f8e6ffed16d
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1