Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d725715e429895…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 02:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5735c12bc02fa5de34097278d77e4d29 SHA-1: 27c00041b0ad2ab634b2297b599c8bdfd9762238 SHA-256: d6d725715e429895a50d8eed3b8122dde512d5809cbacd49325cb960d4a22c91
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fzsvybbs.at/userfiles/file/41615664151.pdf In PDF document text
    • http://alltechsro.cz/files/gunodejaleviwot.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kiltdbl27ok652uifea6arnnrg/satof.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/miwifaxezinanapiwogesof.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/44283427650.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/24440022309.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328d58175d2---2771690300.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/75554265765.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f12607286e---resumopejakejuxabudijuteg.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/75917495655.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/50499791923.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/binopisevononimun.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/8867496159.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/xogeg.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/laraxu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/sojoxajoluwivumawiturok.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/70904510943.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/61317277499.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/44168234322.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/jupuxasakusi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/81400922379.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/xapigaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=akimbo+audiobook+playerPDF 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_off0000af6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 15700 bytes
SHA-256: 39b362151bb0751319a6df635dbd97cc46cbc5af488c90adc86c053d438c39b6
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 10612 bytes
SHA-256: 04df2cd832a3de7b95e530d89fc12f14b81a6a2587391b0888cb6e6c32802e77
font_02_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1