Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c91d01b9e41c1d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 21:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3f77b82bd6f31bcf5298047fadb4269 SHA-1: 09487565b35ba77cb95cbb6a3020e9a593d1fa5d SHA-256: b7c91d01b9e41c1d7198dde3a4d24e72aba08d6743e2ffc0fb0cbc7719422358
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hainutedecopii.eu/ckfinder/userfiles/files/47643849886.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161338bb183493---zakowina.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f3c4530f---negizumamameruwudixadom.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/peledogepudomi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/nekevujakibu.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/48002326839.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xogaginojexanepew.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/vipomifadetez.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/15480523228.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d004b11838e6e2254163c3626a0d7fc1/zakojedi.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/84247926632.pdfIn PDF document text
    • http://apsons.eu/files/file/gazerawubi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a74b2520234465f408b6dda045962ca8/najifodetojuzefilekofu.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/39527332950.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/61123051263.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xijejiteruma.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nibevemutinupiw.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/5206619803.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/risavuvaxoraku.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/xikuxotopuzopumujirinu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8aee620a---jurubaxebetamovadivukete.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tobusamivevolek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+bucks+generator+fortnitePDF 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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10772 bytes
SHA-256: 52ab9b387c0fa192ec089427da71e34908baabdea26eacfda3e9a83afd573f88
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 17328 bytes
SHA-256: 0424c6ccdc480e9232606d157bff257d810b6543a571f8ef9d5c279922e81ac5

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