Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c64257c3cd8896…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 00:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe598921abd6398c0dcacdb8330b7a7c SHA-1: 2c7539e7fcffb12b78b6d21ef8ee2d3d1a483ce2 SHA-256: 84c64257c3cd88960aa296b539f0c8559f8c0c181ad776c5ea034c2c5aaaabee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stavebnevyrobky.sk/www/upload/files/66729376559.pdf In PDF document text
    • https://amitadevnani.com/userfiles/file/mufuvux.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/21805191622.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/99679832403.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/terogev.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0e6b53f8fb23f6aced54e5aa5338380c/venunoboj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160852112aad6e---77970122910.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/pititozudujul.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/muxawosapepozinujepip.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/97362056794.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b6ee56b4b0270ce07bc031ea47bb1ec5/191699733.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4f0b56c6---79333022782.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/xekosuzikowikaragiwufe.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608efebd635b5---xevabigu.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/tevux.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/tojapabisaku.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/72568087718.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kivugovapekikowarom.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/63904211614.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b163bdba5e9---41531034323.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/383594609018b4b4f2595bad2820f4dc/wemobanosig.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607768e98e636---7898492676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sentence+structure+exercises+pdf+elementaryPDF 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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 18356 bytes
SHA-256: 6ccaf6473c140161512649a6281f426f71e328918cef785b6413360907f23466
font_01_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 11052 bytes
SHA-256: 7013b48feb6ea3a28a6767751d4889af6b77910e1b693e54a9fbb9289628aef1
font_02_sfnt_off00013d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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