PDF malware analysis — malicious · b56de35846f0d7b3

MALICIOUS

PDF

90.3 KB Created: 2021-07-25 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: bdf765b6c114cb6be911c9fe5ea9d2bb SHA-1: febd0caa8e0becc2e5023976c08dcd7743199f99 SHA-256: b56de35846f0d7b3e1c8fe2445b4890ea063fe53b6dce2fca2de20e795b602b1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. These links appear to be part of a link farm designed to redirect users to other PDF files, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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 http://barudan.hk/UploadFile/file/20210718205246381.pdf In PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2935e5127231be5c4ac9abe971905955/watemadokexavoxofuzemaj.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9f73f48622eaea0f9253294b1494676e/88908790515.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d5d41b41---didoki.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f0d9e74b---katepowomiburetupelomujet.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2686167958---vamaloxulidokesulupif.pdfIn PDF document text
- http://luatsutiengtrung.com/app/webroot/uploads/files/kemoveratugevule.pdfIn PDF document text
- https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/cddf884084086cffd4921169e2a25c9d/9968227165.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/cda3a7fcc950775efcb6704006468e3b/pimepawikerodin.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160beb97bd291d---nalinalifujerog.pdfIn PDF document text
- https://nucamsa.es/userfiles/files/bolatojojuzijuxibuveto.pdfIn PDF document text
- https://keluargamimpi.com/contents//files/75676732331.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4178699c3---42204701145.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a067c57db83---wuduzexedefazaw.pdfIn PDF document text
- http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/tapenifetopopejufu.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/userfiles/file/46343321754.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1f84a26a---4731985881.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h58dvkqjc4spv1oe5qogbpptoe/vizapuvepisos.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/33319613267.pdfIn PDF document text
- http://plafondchauffant.fr//img/user/file/89354341005.pdfIn PDF document text
- http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vafebikis.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0injr5lchi4r2envd4p425b0eu/14686451120.pdfIn PDF document text
- http://msslink.ru/userfiles/files/7746156289.pdfIn PDF document text
- https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf601c980---somimutoxawegoranoder.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f10f1072---minorirezu.pdfIn PDF document text
- https://cafeau1ait.xyz/js/ckfinder/userfiles/files/tetapaponajezixudewer.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fast+and+furious+3+full+movie+sub+indo+downloadPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f97b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF97B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011192.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11192	11056 bytes
SHA-256: `88524f7aab6a59ad7e7aaec844e910570845a38ce32437660d13f9199f584eb1`
`font_02_sfnt_off00012b62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B62	17256 bytes
SHA-256: `fb3128feddcbd0c1455b0b4e1044dce9ff1328a0ff08701d6f01fa4f70e7eaaa`

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