PDF malware analysis — malicious · 503c9766584fb9c5

MALICIOUS

PDF

76.5 KB Created: 2021-08-22 07:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 316d459ad54b5a981d45781911fed7c6 SHA-1: ed32fb0ae38443bf9de31f693c26aaf9fd50f88d SHA-256: 503c9766584fb9c5ec9b0289a5b288928c4801fbb17e792cdd8a4596860bc09f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9s4ef2afo370n9i8ocp5c81667/nawegefexotone.pdf In PDF document text
- http://eska-lift.ru/userfiles/file/vazinuxirotarogefa.pdfIn PDF document text
- http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/xofuko.pdfIn PDF document text
- https://ckmusicdesign.nl/userfiles/file/66348168910.pdfIn PDF document text
- https://www.profiemg.cz/upload/ck/files/5164462305.pdfIn PDF document text
- http://fsnmmaterials.com/UPFILE/userfiles/files/pazujit.pdfIn PDF document text
- http://kowel.com/ckfinder/userfiles/files/1624717491.pdfIn PDF document text
- https://krossi.ru/images/content/files/22311222323.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2088ef185bee9590f5cf462e26989b94/lemavalekixazo.pdfIn PDF document text
- http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6451289583.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1d9fce4c99975e73c671d03ae75f3361/wifudoravuso.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003cdbb2d37---53311274990.pdfIn PDF document text
- https://at-studio.tw/app/webroot/userfiles/files/20210818_112506.pdfIn PDF document text
- http://krukaiart.com/userfiles/files/karodomi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5e13f360---xanaveremexiputaned.pdfIn PDF document text
- http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/72189721532.pdfIn PDF document text
- http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopebebe.pdfIn PDF document text
- http://vieclamketoan365.com/upload/files/41215631372.pdfIn PDF document text
- https://bepxuyenviet.com/upload/files/janav.pdfIn PDF document text
- http://bezagsecurity.cz/userfiles/31775188972.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15f27a39d4---53199632071.pdfIn PDF document text
- http://consade.com/userfiles/file/dujadutaxemurugivikov.pdfIn PDF document text
- http://voijin.com/userfiles/files/36267224164.pdfIn PDF document text
- https://bursac.net/userfiles/file/pafuvitiguzukedu.pdfIn PDF document text
- http://ebsenglish.net/_UploadFile/Images/file/xiwarezosalijidode.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=maleik+anhidrit+ile+furandPDF 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_off0000c6f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6F9	10348 bytes
SHA-256: `8692eb4b544b96c0167b3ccac6ac8b77daa1a040fd75d29aee3085fa232c638d`
`font_01_sfnt_off0000de2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE2E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f640.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF640	17656 bytes
SHA-256: `aa037f922c039861c1a86a7edea7bd864f72745bd80c535bc13f62ef5ac5c0ff`

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