PDF malware analysis — malicious · a84617f4c13a3732

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 06:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c87c47885ec692b657862618bc74100b SHA-1: b9af88ac7f2d08d34993e7807d55b35e77668325 SHA-256: a84617f4c13a373292abcebaa16090d37b8b0c82cb306712b02770bceb29b604

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to potentially compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. No scripts were extracted from this sample, but the PDF structure itself is indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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 http://aodaibooking.com/FileData/ckfinder/files/20210723_BC618797845F7CAD.pdf In PDF document text
- http://etcad.net/np/upfile/file/31649806958.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160793910de7d2---dobizumowesuw.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/balowiwowemuwafobi.pdfIn PDF document text
- https://laurallo.com/ckfinder/userfiles/files/12074103991.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609b750046493---pitofenaxasatuxixepovez.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/wuvujat.pdfIn PDF document text
- http://cpgny.com/userfiles/files/89300835638.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b35b556be---14209735132.pdfIn PDF document text
- http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/givebax.pdfIn PDF document text
- http://castel.lu/userfiles/files/6091882452.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b7d560f5ff66c8979548bd9a2013e223/48784819384.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecad9e549b---nodivepikifagibisilew.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a34a40ce---sopupasabuwugin.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789d6460a24---98833133226.pdfIn PDF document text
- http://studiobaliva.eu/userfiles/files/buraxexav.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jpg839s840urtu3mi74pf9p1sf/zuwutufufatub.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d91414454---sakowasokilefajegek.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/44c70274f636c9b80fa676eb92d52bc2/4808406600.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7d75aeb6ea90a4696a2fff0b858f328b/16510381304.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/43547611754.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f299e6fbf---xelakorobu.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b899802d71e---zowupolaxu.pdfIn PDF document text
- http://blankheich.de/images/uploads/file/17034349562.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd6727ace---34820473350.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=geometry+dash+2.5+apk+modPDF 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_off0000eb0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB0D	10980 bytes
SHA-256: `9ab82871bdf70008f1c696109091fb1a66cb14613bd574c4f079fd8d55d3cf84`
`font_01_sfnt_off000104c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CD6	16684 bytes
SHA-256: `2d9f648b22ce4d53d27eeea727e7cafa0a88eb112ecd927157c9a476c22f376d`
`font_03_sfnt_off0001484e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1484E	16352 bytes
SHA-256: `3c5b36d9b6774e7e2f3fc889af402f57cc2db9de150fb6f6cf207a5d708f39ba`

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