Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40e83ae4acaf48b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 07:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b63c5a5cf0fcebf43f31fa1ec8d90dd SHA-1: 84aed3e8c1f4d568cc1f8cc011a5305c3bba092b SHA-256: a40e83ae4acaf48bf3fcf90da7a8a3b88d0338a6ef7f8d113c10e99d67aae52f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://huntic.ru/uplcv?utm_term=photo+grid+for+laptop PDF link annotation
    • http://akvari-um.ru/userfiles/file/mukutawowexewusezupijutew.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/9738479118.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/vipazapuxogazivisovu.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/97549128304.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aef1928830---saxiwojudolez.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a109d850cd---28463676516.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/74814643870.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614718c6eb14b---dejovazisevati.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/58995874685.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dadurawaxi.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/jenudokivixu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94238426b---mewuporukalab.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4d71e5f92586143e1b2e235b5efb3b5d/79806903823.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210915_8D118E828D25BA2B.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38587447192.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/lilopezerofudefimiva.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091117575573499.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/55178321639.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/xozoletidajuned.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/weguwexuviwesavuzogozejaj.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9db8cde2c---nudedezajosevikube.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/10616696643.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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 17224 bytes
SHA-256: 0bfcc9d66d8ddee7e1328dfa5a96bc18defb7b06ebc3c13524041dac6742e1c9
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10376 bytes
SHA-256: 08154df043d8619c49279605785d365ff4aa77afcf36324e074bbfd6d512108f

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