Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d77077d64072ac2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 14:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 706720eb5f55dfba1cd43dba3e0257c7 SHA-1: 683c17e187e989632dc4be5a54dec50f20a6968d SHA-256: 3d77077d64072ac23d2da486b81b9498c5c6c2fa7b7a624fae94944e09b3fc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://www.kotolantopeni.cz/files/79230432292.pdf In PDF document text
    • http://hondaotohaiphong.vn/upload/files/sifezisonujijupudufabevo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/48224088015.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/11937793227.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300341303165.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/81030524655.pdfIn PDF document text
    • http://skupka54.ru/upload/m/82728221064.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/cf9a3f0edd4eff49696a0ded8e897a7f/11670223312.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/bewiduramugadozanilif.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fisonegifeduxep.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/wifeguregon.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1782678576103d981dc897.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/xesugujo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f1a3c7b7---tanirijitilurifix.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/piwobidovixotodemojero.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609575c1bde65---88205651031.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c508a1e4c3b---namifosu.pdfIn PDF document text
    • http://land89.com/ckupload/files/56546037400.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/lipigoduko.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/13708460735.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108010708506788.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/mojubepuwaxomolijawujinup.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161165cece5f92---vikipozefisegikoxitilupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pdf+creator+for+windows+10+free+downloadPDF 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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 10732 bytes
SHA-256: 60e285840ffa35918dc6aedb6489d39a858784c381d5fad2b4b6cfff02195f87
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16440 bytes
SHA-256: 1e069cd9090570737bb3aab4703c08ccba625a20c452d7a375110b764fdaa71f

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