PDF malware analysis — malicious · 18b0574c0f7d43a3

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 08:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 39c944ec6e0f6f00ed179526b323d018 SHA-1: 98fabc0545846fc78551264a2b4d44bb41704f72 SHA-256: 18b0574c0f7d43a3439bbc63355975ba71fd6fe0fef580fbae87f9bb068a47a4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to redirect users to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7bfbc2d02d2bd0cf8f83ad0b7174fcd1/85137967088.pdf In PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097abf05c285---dipovuwuguv.pdfIn PDF document text
- https://hgb.se/filer/file/59228239752.pdfIn PDF document text
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b3ca22b9---32368271216.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/df9e155fe9db57971cbbd5c1033dadc7/boxewuperalotewed.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/zipeligo.pdfIn PDF document text
- https://www.hippocratio.gr/ckfinder/userfiles/files/99438340694.pdfIn PDF document text
- https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/redefitiwided.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69e777dba9c5c3bc7d76baf1f609f28b/17043877313.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c83a086248---gunebepilika.pdfIn PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d588b438a---8554823353.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f7977b5e5573f94974e7321a051d587/18744954878.pdfIn PDF document text
- http://2ds-creations.fr/userfiles/file/44038495871.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0305bdef1---fareloludasunumi.pdfIn PDF document text
- https://doucetplasticsurgery.com/ckfinder/userfiles/files/makepizunepu.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/70771368948.pdfIn PDF document text
- https://baigiangtoanhoc.com/upload/files/gonebixe.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d503cd8eb---nupazu.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7049e8c6d6---teruvomakozajikupomu.pdfIn PDF document text
- http://thucphamchucnangmy.vn/uploads/files/bupevuvelepovoledo.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3778c0aa---67687901659.pdfIn PDF document text
- https://motelandratecuci.ro/userfiles/file/fabaxaritozoburugok.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac4754083---2339272513.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b3fb5f22---7167766501.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+quadrant+in+mathPDF link annotation
- https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/vewusikuxegogim.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ecaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECAF	19064 bytes
SHA-256: `79b5e193e2c7562d92257efc8c5004242a99cc2d7128bd03e112dae0f6e6bf91`
`font_01_sfnt_off00011ea4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EA4	16060 bytes
SHA-256: `8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825`
`font_02_sfnt_off000133b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014bce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BCE	10824 bytes
SHA-256: `09da913f077af24bf36b70921de9913780b7fc7727bee0664b2834c3b75efae3`

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