Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ced63abfc8e6f8…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 15:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7c509b4c63ddd85b07d328f110e08a1 SHA-1: bab81cddc05be0ce88d4d666f1195a678d577b8d SHA-256: 36ced63abfc8e6f84331b6e380a9c6173cf34aaab4533597ae4edaa43d9bfa9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, forming a link farm. The presence of embedded JavaScript suggests it may be used to facilitate further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chi-kara.net/userfiles/file/gobevewojugobisoririg.pdf In PDF document text
    • http://usefchina.com/uploadfile/file///2021091403575824.pdfIn PDF document text
    • https://chptravel.ir/data/file/8275561314.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/99982147428.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497bae22ca1---4099329796.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/danopewetugikamunasunisug.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/51384041889.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/43953682943.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/72270620023.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/64446542843.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2rciao97ah9r08p9k91ocjpil1/susudoxavorox.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/97232597359.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/15186332458.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/51335885913.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/tapimifiwoxalikabigaxu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d83e05459796faa0f2bbc50eb0be010d/41469955678.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lujuvogatitibu.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/79427900404.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tamuwadapurimemopazumufif.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/22690716189.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_B0106C462590A017.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/30725994051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=apowermirror+internal+audioPDF 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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 18288 bytes
SHA-256: 38753ada584f8cedb03bdb90a9f48fb39b3ef763ae28ffd24d422e92cc2ac901
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 10552 bytes
SHA-256: 9a27baecdc0234099674ff257caec8975c56ee71afc1fd9013c0cfd64cac2bee

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