Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d80248683bcf54b…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 22:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b46eaaba989fe0e38fb0fabaed468404 SHA-1: 7e3593231f775ab2841ba6501f89d566792a86e8 SHA-256: 6d80248683bcf54ba9e5f1bcb4ae75a65a6174dee01b1337eb7ace6861194910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF also functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. This suggests the file is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://secretinvitation.net/images/files/73990985326.pdf In PDF document text
    • http://zkojicin.cz/userfiles/file/62593056796.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/204272ce1b0b929f4d2dae929caaf70c/fidegitezilimivinav.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3faf161f9---18556960175.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d608b66a8e3731db296d70922b59e9be/jelasewepawekim.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0eaf3ace87d4b3f192fc75d6e56aae5a/konapezolal.pdfIn PDF document text
    • http://cobmedia.hu/include/tixodexefe.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125866d52110---36871948007.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/91837015755.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/netevipamexatikeze.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/76533605753.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/46395943480.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/godowov.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610befc0b01f4---zuvawividuzo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1125dd53b9---98166925010.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e1752f352625a1da1acd19c6b8773a6b/fetoko.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdffa15026---nisokosadalasifi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rb5qfs8uonj8ogat9nnaq9ds3g/bubigig.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3k9dntaot19ramgk2vlj3u33me/nenilusuzugex.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/tezusevamem.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770fef4d6f7---33269393316.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/74132043683.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/kanexavogogojakuv.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3357035f---wutunulizelejisaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ochrona+przeciwpo%C5%BCarowa+lasu+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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 11000 bytes
SHA-256: ede54825fec8f7597fa236e4a00b7af30a6b56d629a1a6f515dfcb6bf129994a
font_01_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 18452 bytes
SHA-256: 573a77be762e962c2cf45d9d05d248fb9c7cb9eaa552a3f1779d5027dc5a9aac
font_02_sfnt_off0001402b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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