PDF malware analysis — malicious · 5017f3b77834f3a2

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 19:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 85ab8c41674b851785c05c0dcab53805 SHA-1: b0a0bb0db4f55ab2c9c2b5503a2d5bdb8b1083b8 SHA-256: 5017f3b77834f3a26389dce6f995acccb6dea4f481d0498536076ebba980d3df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=minecraft+server+to+hack+on PDF link annotation
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddefad67ee---garejubegisudavirikibede.pdfIn PDF document text
- http://joyandwowbook.com/upload/file/kutemizadonum.pdfIn PDF document text
- https://fototipia.hu/files/files/21757401078.pdfIn PDF document text
- http://gachbinhduong.com/upload/file/sagowidubalabipabebid.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392a1cae4f7---jemixupuresilapu.pdfIn PDF document text
- http://homeopathyhongkong.cn/files/nadadikeniwofilovewa.pdfIn PDF document text
- https://bibonatura.hu/ckfinder/userfiles/files/mefigalaz.pdfIn PDF document text
- https://hijaustabilo.com/contents/files/22943324102.pdfIn PDF document text
- https://dichvuhappyhouse.com/upload/files/sojorajitonowafusaviret.pdfIn PDF document text
- http://micdelhi.in/userfiles/file/27403204492.pdfIn PDF document text
- https://jeanmarcrobion.fr/userfiles/file/5386935768.pdfIn PDF document text
- http://udaybharat.in/ckfinder/userfiles/files/78958165908.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/wojibonotivepuzivi.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c877489e5caa724a360bfe9fa369dae/76942810368.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0v5b09sbebnicp7qnfopr8vil5/menejiwesawagube.pdfIn PDF document text
- http://www.asiacoservice.com/file/files/xenikilagabujupilagogi.pdfIn PDF document text
- http://world-green-hope.com/uploads/files/wanawinobigavepu.pdfIn PDF document text
- http://targhevaticane.it/userfiles/files/23641847757.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnfrc2joj3p21fk8b7n9lev195/revamotufegonozatunubal.pdfIn PDF document text
- https://ismet.com.br/ckfinder/userfiles/files/72767302461.pdfIn PDF document text
- http://avandcie-automation.com/ckfinder/userfiles/files/57894185272.pdfIn PDF document text
- http://gutachterbewertung.de/userfiles/file/xebodetefujujukopodananu.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141931d01566---32718192530.pdfIn PDF document text
- http://kvarkeno56.ru/userfiles/file/21612455348.pdfIn PDF document text
- 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_off0000dcac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCAC	18832 bytes
SHA-256: `df45b186de45baaee226f4db0247d890aa356c787657c277d22ac39ac6a0d013`
`font_01_sfnt_off00010d14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D14	10540 bytes
SHA-256: `645aa99a07d666caa4a7ec1f231118986191199312d3edc1478d377aee9d963b`
`font_02_sfnt_off0001251f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1251F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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