PDF malware analysis — malicious · 3c5d25511d355359

MALICIOUS

PDF

97.3 KB Created: 2021-09-03 09:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 268c8eab02e2f57b4ba50110ae3a7969 SHA-1: d99c2cff283dd1cb2eaf1acc47b580aac3c7b113 SHA-256: 3c5d25511d355359d157a487c36c6bab7d6ba544667005408d4e14415303850a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://sindonis.com/userfiles/file/79805800688.pdf In PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c70e8eff3---39779880535.pdfIn PDF document text
- http://feach.ie/images/uploads/file/vivigevexupulekazerulat.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160825b891f103---40836023114.pdfIn PDF document text
- https://tadimtursu.com/image/files/29046093244.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/499926b4d43bf5e3058dace909e9243e/593778967.pdfIn PDF document text
- http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2150335875.pdfIn PDF document text
- http://homeopathyhongkong.org/files/55289049555.pdfIn PDF document text
- http://skogsformedling.se/bilder_umeny/File/22012772720.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f996919a0---71333169515.pdfIn PDF document text
- http://sarica.com.tr/ckfinder/userfiles/files/76769166995.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160826f23deb56---ludupepi.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4f7c096d---tutigogoxizutok.pdfIn PDF document text
- http://chataphan.com/file_media/file_image/file/36888935432.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720fe16eedf---35113962307.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d3ed73ca---manuforulemesojizoretiluz.pdfIn PDF document text
- http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/miwiwezunefexa.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/perorosudidire.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4bbb368a5dcad41cdce712a2051e2be8/40465899862.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/file/8226433213.pdfIn PDF document text
- https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/nijetoniparib.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1n7q3jm4evijstu03dpt4vs1u6/bebiwixumunaxafasurupen.pdfIn PDF document text
- https://rosycaffe.com/file/8749057483.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ff3e1780bbd2ca7efd41c057d33c090/31427428990.pdfIn PDF document text
- http://bioterapiazabiegi.pl/obrazy/file/refilif.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dhaka+university+admission+circular+2018+19+pdf+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off0001474c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1474C	16496 bytes
SHA-256: `d0dda2b45a5dc44350fcb52c8c05100905d995e2e7ce3fcf6688c58d6ed55704`
`font_00_sfnt_off0000ed26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED26	24168 bytes
SHA-256: `64b62d0d282551693acf0074fc7114981bd037542562bdab107e40fa27fb7ca2`
`font_01_sfnt_off00012a5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A5F	12016 bytes
SHA-256: `6ae1d04d4c9d30a3e06b0e28c3d5802916f66b7c9fbb280ca34b332c9bc22987`
`font_03_sfnt_off00015e69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E69	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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