Malicious PDF — malware analysis report

Static analysis result for SHA-256 c327f998daedac1f…

MALICIOUS

PDF

109.8 KB Created: 2021-06-28 00:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528d2dcad77ae219c34876b0a263dc80 SHA-1: f54f4d10201b18ada05c335c1f6d62168f71c85e SHA-256: c327f998daedac1fa7de6d2312284d68b9fb349fb960f430bd08aa780d654c67
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this, as these are often used to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/87445828378.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/408f831444ae1b25dff5f2f2dbd74375/39619184618.pdf
    • http://citra.cl/userfiles/file/bavatumuxupiwemirive.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4hotb6lqan2mc03rh2ssp5c5dg/45599419962.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa300886df7---jezoxujomisidomuvob.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uiuiaeuakml8h5mk044e4837i1/78956884807.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/26079509190.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9707385c15---mobedotelozupuwatedinave.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074809c40529---jutalutixubetowezu.pdf
    • http://mikailang.net/userfiles/file/20210501180140_643761670.pdf
    • http://amphorabeautyclub.com/campannas/file/junexavu.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fcb84856b9cef45a87ec1bcec2616886/lonuwop.pdf
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/98f90b2099b8898da16d592045a9854f/5926141586.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/380128cfe7fd51c2fab7213adf8cb278/96732576963.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740910dc4df---71135945668.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ti47gd8r6fko5jsnavgfmfvlc4/43402391544.pdf
    • http://studiomuraca.eu/userfiles/files/86747937973.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5489bge98a9b9ekoc3gp5lju5s/wejug.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9f697ece---10083487287.pdf
    • http://pphu-joanna.pl/fckpliki/file/firedigajejalulagit.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987bbd36c00---sijukidaxalovenusamezi.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f31255d384532111aa2af138159e7314/27565366627.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609731a20c9fa---55759582803.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a092d3ddb71---70821885371.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=coco+arquette+charlie+west+arquette
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001479b.bin
ea5bb23a0e918df9b9cf0ffc3e1b496c6cf4324cf663f525e84c02743c84181b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1479B 10588 bytes
font_01_sfnt_off00016009.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16009 16792 bytes
font_02_sfnt_off0001781b.bin
b60b7db73499d64011ba134e8319ae2893d94ce0075920eb2c68c8c64184e10f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1781B 18716 bytes

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