PDF malware analysis — malicious · b5029a9e6748a7d5

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 19:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 65fd6136bdd33856eb33d5d132b148e3 SHA-1: 6de4a93dc025f0ffe91f75624992139809cf8f8c SHA-256: b5029a9e6748a7d5fefb9cca4b22df15d110eb15c52a291edfa6135ed6242170

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to download further malicious content. The presence of embedded JavaScript indicates a potential for client-side exploitation or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/31f7lnq57tkgbp3299cisrh5s3/kupipin.pdf In PDF document text
- http://gyobel.itpublic/file/8117911007.pdfIn PDF document text
- http://lexus-custom.com/js/upload/files/73321441206.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099da097911e---dajefunilinubi.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/dkhcg6ep392anvpnleamac06go/legumibexepoluwutegamo.pdfIn PDF document text
- http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/kijenet.pdfIn PDF document text
- https://bushregenerators.info/userfiles/files/40120837179.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/859gq758gv16vrahg7e5q8g7du/gewuloduxipi.pdfIn PDF document text
- https://dalilak1.com/userfiles/file/rululofosi.pdfIn PDF document text
- http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/85ab5fe03f8df576d20e2d2a26575030/tenijabawuzoniramofa.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/nlt5k96m3d7j37qf793ah7dmq3/woxedifobesifo.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/uqhkgr6bh8fa8neil4jn7j0r7q/71701915754.pdfIn PDF document text
- https://searchlink.org/userfiles//file/96166908817.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160beff4310d8a---33768461944.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bebdde530---wuvorobidepudolamogud.pdfIn PDF document text
- http://smepil.com/ckeditor/userfiles/files/6145709147.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e019e0ffdbcf300a9625c11e19d97774/lajukulimapituvujirix.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c65c1fc10---26164245418.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee95b95cd1---42474191148.pdfIn PDF document text
- http://kapsalonvogue.nl/files/file/1017425272.pdfIn PDF document text
- http://hoangminhphatkorea.com/webroot/img/files/29667723086.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/felimakisuxo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=alphabetize+worksheets+first+grade+mathPDF link annotation
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a61be6475700a551a98c4708267ca44c/gamibalenoxidilorofovu.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE77	11200 bytes
SHA-256: `588beea5578faf0ccca166825ed2cdf7e7ead515b408778d62d4a7a98109fbc1`
`font_01_sfnt_off0001085f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1085F	16924 bytes
SHA-256: `df5e586c9f3f55cab5651e87d5cb895bc84422dcaf51c1c97dc563cba0d23e8a`
`font_02_sfnt_off00013494.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13494	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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