Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5ea552382b09a6…

MALICIOUS

PDF

120.9 KB Created: 2021-08-12 12:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2b8b8880ef2914dfe8ca850d66199c5 SHA-1: 9be34f17b312f018b087beda509bf9ea0fca263f SHA-256: 8c5ea552382b09a6aba4a865b375c5144e3d1a8febe21547c2b3a1f0fde9a010
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and the compromised CMS upload link farm suggest the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://collegium-connect.nl/ckupload/files/zofawapakim.pdf In PDF document text
    • http://efuturesthai.com/uploads/files/jamojabisijotelu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/3265697813.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/sexunusegifatofe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nilomotodifupobedubujo.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/71628611096.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vadexupopuxek.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caedc7e8d89---seragaboxinoratobidigo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f90ecfb3---15755449198.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608985b3e5231---91613983799.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/kesanajupefes.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/pufare.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1b57a76d---kujewesi.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/mevebuti.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93b5898fa6---fifusozaruseboduj.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/dinukoxo.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/tajukelodamomamomuxisutu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e89fc1eb4836ad689ecbbe90bdb9f79b/17601268920.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/wemuwawokozivejok.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a410e1c909c---wibogojilisumijixalamaw.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210611_57F428278B676FCF.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/42812273499.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1292694a8ba3e7d74a8cc812ec4139d3/22147812491.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/67835606415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=infinite+warfare+cheat+codes+ps4PDF 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_off00017647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5E 10788 bytes
SHA-256: fcc0a83058791bc11e4de94dde30c1ee87cdc2dce3870c4b08c0edcb446a7404
font_02_sfnt_off0001a744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A744 17536 bytes
SHA-256: 924ae21a26d2bd4d8cdad38276e024e3680ff674dcdbd6787b3a24280359feb3

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