Malicious PDF — malware analysis report

Static analysis result for SHA-256 85276f4f5938b790…

MALICIOUS

PDF

125.7 KB Created: 2021-09-04 23:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f80446578f9d1d24eb62f220a87b74cb SHA-1: 12d0db8b7c446dcf0f144efabd1b9b25c42654c3 SHA-256: 85276f4f5938b79091a7a67020926c1fc809602989b67586afe571472a09465c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, suggesting it is designed to lead users to phishing or malware distribution sites. The presence of embedded JavaScript (T1059.007) and the likely delivery method via email (T1566.001) are key indicators of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/d592d0808c552cd83dfa44011d4ac62b/gozediroz.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jckbrhtob0dg62c02qu1siu3gn/60185435056.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/03b785fce3bc332180ad86b8809a05cc/95924121240.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/13473ee6c20fa3956e054c5122f5ae0d/34310950428.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vuvizupapewafirokugoxijo.pdfIn PDF document text
    • https://aksusu.com/upload/files/pigawabofefeza.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog//file/varowerimawuz.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/9725956385.pdfIn PDF document text
    • http://usagimatur.com/files/others/22222214319.pdfIn PDF document text
    • https://guijek.com/userfiles/file/pukiwetilo.pdfIn PDF document text
    • http://zatacorp.com/upload/files/15576181937.pdfIn PDF document text
    • https://atlantidegattico.it/file/11248475954.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/biborewared.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/56891333716.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kidunanegolovenovopilize.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/81796249273.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/30713179226.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/fevatedijixopu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k2us8e94rn38esi9d3ojo2co84/93541027056.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/nafuti.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/88628746370.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/vetov.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/sojalimavapikodi.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/fabusosufodumomujibefor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=carlill+v+carbolic+smoke+ball+company+pdfPDF 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_off000183d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D9 19880 bytes
SHA-256: 63155f991363e8db7d60fa7bcbe37c38d7d21a854a95b1b2d94d8a0302380380
font_01_sfnt_off0001b6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEDE 11128 bytes
SHA-256: e0edc1ae0fc23b06fb1fcb506ef8b8fe01218aa06c75af70b9631f9ca4946b92

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