Malicious PDF — malware analysis report

Static analysis result for SHA-256 311e5e9badb78d05…

MALICIOUS

PDF

75.6 KB Created: 2021-10-04 00:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c9655b6ed74445855e8c6be0a52a2ca SHA-1: ff3480ae930961329fb4d048ed384c8af9eb3825 SHA-256: 311e5e9badb78d053a2585075e98418043e06fbbadd6c0504085bc5ff6b64b49
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 are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=happiness+consists+in+contentment PDF link annotation
    • http://vektorma.ru/uploads/assets/file/94917241459.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/vinasolimagularowi.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/lupapano.pdfIn PDF document text
    • http://prota.ru/upload/files/tokebupozi.pdfIn PDF document text
    • http://gw114.eastman-intl.com/userfiles/file/farobe.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/pixisejejezapaxazeduled.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/03426bbec3b4c0192893cb39bd65be93/wisupuzewerolopefirufenes.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614184842c166---gepuwerexarofavovo.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/kibatukofulogirasib.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/vuvadizavabuxazukafeb.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/99090183455.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/30111734048.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/66041175096.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/renoruzaxobij.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/52696810805.pdfIn PDF document text
    • http://boxethai38.com/upload/file/movorivawutusifisif.pdfIn PDF document text
    • http://sungder.com/upload/16671758635.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sisis5kdbmh2r9qevft3n35lng/kizosaxize.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20211004_75BE35B9CE4E2B96.pdfIn PDF document text
    • https://bloomeng.com/uploads/78436424510.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/11933778428.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/ralodenupafokifepanoxel.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/xapaliropatapud.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/14349729800.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 10380 bytes
SHA-256: 9c45d5c1b842a4e48049fe9df421382d3aae6e763152ea5ccd2454fcc65ee9a4
font_01_sfnt_off0000cd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 2276 bytes
SHA-256: f209b4b7413667c9d7f1bed3fe2f0235f1f64a85a08b9c0ac72da7d3bbb75124
font_02_sfnt_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 18340 bytes
SHA-256: caac91548a7acb04db9045c98566d67eb21fdf472a2c3e3b4ba267d5cb26eb04
font_03_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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