Malicious PDF — malware analysis report

Static analysis result for SHA-256 7167136f59dac3aa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 14:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7574731e0aa58ea1b8f6c06b361aa58 SHA-1: 86c5d51c839a8f7975e87c374f6b91c0b769408b SHA-256: 7167136f59dac3aaa4c6d45b845b33150f39e4fa12e9f242f6be7629d6844100
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised websites and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=cinema+hd+v2+for+laptop PDF link annotation
    • http://nationalherbo.com/userfiles/file/kulonopobovapadumo.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sutaluxuwaku.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fivovigofozibefopomepo.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/34209179937.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc7e38d9d4afa1af13c3c11f0e469e69/nenokokepojir.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8a958ea7690b7681ad06b009b2616372/20695849586.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/semowekobelonubekopel.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/60431634916.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gusisudevodulajolejax.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fawakifugorixali.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/20140808045.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7029f6999d2ad999484ebe3ad55461bf/vubelixuk.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/31279793211.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210914_1B810013C77B7452.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/161400044807.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/kupobumapa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f940b797495c91bfab413e99845f1361/67396486604.pdfIn PDF document text
    • https://agatanorek.com/files/file/45565778630.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/68404213754.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/65773262057.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/joledovizel.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109121231149477.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/67949785195.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fac758d01---jirakefuzawewewilarovu.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/98600815707.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/58920504180.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/32520047013.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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 10812 bytes
SHA-256: 227b9dc759008c2aab945fc55a36ee6032a15e6f046a0b68a28dd73c9169c4d3
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 18708 bytes
SHA-256: a09ab68ea23d8a6656c2e3a71e22f18104d6065251dba4050a88d9fc1fda402b