Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b32b366dd0f493…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 12:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f56e95bd70e8c639e36d687a9d57c38 SHA-1: 39953cee761aefe0f2a78045032f23d043fd135d SHA-256: 58b32b366dd0f49375cfced5a44bdaca61cf69631f5210672e4a378d6d60f60d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to domains flagged as compromised or disposable hosting. The presence of JavaScript and the link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://odnoklassniki-files.ru/images/uploads/files/bidawurexogugozivexawal.pdf In PDF document text
    • http://ladyvenus.it/userfiles/files/gubovutefugozeji.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/risawirij.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614050a23a060---99304618498.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/78157768456.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/24628631766.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/76527205282.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fejenufegawulewozox.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dopol.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/66769042691.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/33522625252.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/9885104153.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/fepumovawomojoturak.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5d148c1cc5dbadeae746dac086e8b06f/pofujo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/44949114769.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/miroxisow.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/kevisi.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/noxerujipewupikiwofarubem.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/65844528702.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/losigipedamijale.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/61193503763.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/tinaven.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/48474305951.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5231d5794350c99347a42280e63bbd47/ketilewudukofisedevi.pdfIn PDF document text
    • http://lecostationery.com/files/file/88519646382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=among+us+download+without+emulatorPDF 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 10864 bytes
SHA-256: 072857ea317e55c603c35a261c6ca68ff1ced24f8935ad1f426aa79d2d2aad9f
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 17316 bytes
SHA-256: 73ca8a299033395d213f312265e04372d23a0e1b59b840ef99d9fba020e737d2
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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