Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a4d42abe4b7a62…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 14:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6eaa50369e8acff266fee25279adf55c SHA-1: ef035b03726f0f4c2957b81564e40c934bab18ee SHA-256: 55a4d42abe4b7a6240569613f2999b60ff50039a36e4ac4496498a8915da0325
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://catherine-massage.com/ckfinder/userfiles/files/98794376435.pdf In PDF document text
    • http://timebymtm.com/upload/files/dojoligimozanavamu.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/26329434886.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/41575571946.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/18380271644.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ni19ei58amd89em5iiuk7mud6s/85147386444.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/kerazubonibonipowetezak.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tijedaxafasimudek.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tipubipibopuvixa.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/19726231744.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/84705635913.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/dovobate.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lamoxamotimeseranog.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/suborabewuraxamovem.pdfIn PDF document text
    • http://packturf.fr/files/dabisofejokixapul.pdfIn PDF document text
    • http://orthopediedelft.eu/files/muwitakifake.pdfIn PDF document text
    • http://minhanh.com/files/dokibiwiwiferadibebirini.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/ruvudexoti.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/7862865165.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb6cdd7126---diditemarizu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ccce1b456---92334567482.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/liduzasagetusi.pdfIn PDF document text
    • http://rs-entp.com/upload/file/woripinifibadijowoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+camera+android+phone+2017PDF 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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 18180 bytes
SHA-256: d77360b84729c56d7133547b0a5797f8c1d089e7e198f6cbbb4cfb564326d0c8
font_01_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 11132 bytes
SHA-256: e20ca6f63eeae2307e126481b048fe5196e8116ebd81fcc3ca466acf039bea47
font_02_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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