Malicious PDF — malware analysis report

Static analysis result for SHA-256 133ff1c00aae54ba…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 06:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24af615729827e41e52b2cc87a4bbed4 SHA-1: 8225f8e53cae02dc101ddbf02e5955884339912a SHA-256: 133ff1c00aae54ba3b8fcb147934b85285b03fa87650029249abd295ce57a077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to create a link farm, potentially for SEO manipulation or to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=pregnancy+categories+of+drugs+pdf PDF link annotation
    • http://songhakbbq.com/uploads/files/65128005340.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/kufozerefitanam.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/41748767487.pdfIn PDF document text
    • http://atek-ent.com/upload/file/nululowave.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5fe29b7688bb8f4810a2e916b3e0e87c/74595136445.pdfIn PDF document text
    • http://geodez.com/pliki/file/saremud.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ggen9c5tj7440p4qeccbj4jq51/tememipefuza.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c960206e4---88102644645.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078690cc7ba3---83381876405.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9f59745012dbe5c4bed87f218998a79b/20347459716.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/fc44da3538d1ff14d56d8f388e81b4c6/kulena.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/d3l2rmilhimu1nrp9l13beh901/53376073371.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/xovap.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/dopalekujinu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5iq0bpg45smm47621mr6cdrpcr/72819928881.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/lonemotuxunevusexexawu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee22a6da3e9---72692806513.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xowipo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/23258777338.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a718611d8---40740268100.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa8d4808---58747549483.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/dovetejipaboda.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/65043794765.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 16048 bytes
SHA-256: 66e575aa5da93e8f0b138191b67c42329e40ee7b950915e06106e5d271ea4bc0
font_02_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 10964 bytes
SHA-256: d8a876bf240d78960ec4d337fad9dac76c0ead90436e68d819af13b01a25b6cc

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