PDF malware analysis — malicious · 5ef5bffdd3406b88

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 19:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 02dcba3619ec5d9ffbfeb6b2e1ce0e8f SHA-1: 050828c8947e638f78820940f7bb11d8bf610b06 SHA-256: 5ef5bffdd3406b882ca427a09ec0022e1cf35962e7ab63baac1e000d110fcc45

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The primary purpose appears to be to redirect users to potentially malicious content or phishing sites, leveraging the embedded JavaScript for execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

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://herfon-machinery.com/images/ckfinder/files/20210627194926.pdf In PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/84vcld90n953edvign61r3k8tu/5053946026.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/oaehg53jgvtual8bujs9fmfgt0/zapik.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a04573921---77296641917.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739856db5d8---tawoworugame.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094370a97a73---11859534222.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084767e53d3d---dovovejowip.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f9146c82c648b8e341c976a775a44827/goxokonudoruxadidepi.pdfIn PDF document text
- https://kodcomputers.ro/2664/uploads/5761033839.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee59e89ba2---jesetedugiwekej.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/11595244914.pdfIn PDF document text
- http://k-ookuma.com/js/upload/files/62162084047.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dkjek9d6jcchaoasp3vnbh8404/bilojomososof.pdfIn PDF document text
- http://grawerlik.pl/userfiles/file/13081204326.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359ef8491e---jasolu.pdfIn PDF document text
- http://kingalbertltd.com/uploadedfiles/file/jigozofotatukiwarip.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1031b1c809---daged.pdfIn PDF document text
- http://cloverdiamond.com/file/52573917352.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946df88144e---9347805070.pdfIn PDF document text
- https://strechybenesov.cz/content/85265158869.pdfIn PDF document text
- http://sakuragiramenandsushi.com/uploads/files/rekejimetobizajador.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b5078ac26022f57c0547d126cd042f2c/vozupoded.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/72f387053aee9f6f960b6564cacc6147/1069150156.pdfIn PDF document text
- http://timnhanhonline.com/upload/files/sixakodifezabozubimetalod.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=integers+exercise+for+class+6PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10224	17592 bytes
SHA-256: `72799345d568c4e622c1b128670add19ac12c452e7410ee1386b57d8912eca78`
`font_01_sfnt_off00012ff2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FF2	16144 bytes
SHA-256: `5f2a87ed485690ae99dd00ffd3dad57dcaf6de75c4981ecbeeee12bb760f3f7c`
`font_02_sfnt_off00014550.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14550	10732 bytes
SHA-256: `03c7066f2a576239e2f5d890aa971e6d09e45f0935b67c845d7b3f591963a564`
`font_03_sfnt_off00015e26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E26	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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