Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f55f64069154e5f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 09:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 561193b92ae0e2cefbc2bac95887c0bf SHA-1: 44136b08c29a21618cd63a12da5681e3ec7396cf SHA-256: 7f55f64069154e5fcd0f09142cb482a50ec9dec4d4a8f935e5ae241b9332f364
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cakkue.com/contents/files/10814355454.pdf In PDF document text
    • https://035620126.tw/upload/greenkitchen/files/pikiviwaxexe.pdfIn PDF document text
    • http://tzsunup.com/upload/32713682548.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/gerumuwixawer.pdfIn PDF document text
    • http://vuason.vn/upload/files/60267761080.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/xozudipevi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161420c9e085fb---rebikumebajabaneteb.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadd57d4c3---dofugik.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/8708981942.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/lisuzizewigajiwimugubeko.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/74808047708.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/88321827813.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/wolulaletonilevorid.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/84747431931.pdfIn PDF document text
    • https://estoniapools.com/contents/files/nezevixunufebanajowufev.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144660c8145d---48799813843.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/gasobim.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/dimodutiwomug.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614307de17286---foxejoxiba.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/24069066107.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614416df3576c---92907414315.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141387861f4a---61821051719.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/fokuzorazanopu.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906121038730763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=splat+number+gridPDF 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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 10764 bytes
SHA-256: 81c27d1dad76051baba853f9de6494ae3f30ba169bafc0f71f36b2dc2486bf0a
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 17380 bytes
SHA-256: 3a09643101d5a80faeb562107d508d58b79e13c0656da616612555ad8662c9d3

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