PDF malware analysis — malicious · ce859d75d0e22b8b

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 20:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 7f022d61da677f9c3c96ac3c0cedc409 SHA-1: d7990a52ec39e0096ae90fa8f5f262bf6d1da64f SHA-256: ce859d75d0e22b8b4acae53923f1fc94fe7d5ef356750363f58733919a82dc98

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=atomic+radius+chart+for+elements PDF link annotation
- https://sdhouse.info/ckfinder/userfiles/files/50537999383.pdfIn PDF document text
- http://candemdientu.com/Images_upload/files/tojawopuvepuwakasivunewu.pdfIn PDF document text
- http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/viwixaxaxifupuped.pdfIn PDF document text
- http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/4362001456.pdfIn PDF document text
- http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/81872272599.pdfIn PDF document text
- http://dungcubepgiangtrinh.com/webroot/img/files/81119883779.pdfIn PDF document text
- https://sangolongphuong.vn/longphuong/news/files/ronixigovowalewefufevatoz.pdfIn PDF document text
- https://pharmnet.cz/ckfiles/files/files/pejojewivotilu.pdfIn PDF document text
- http://bawaconstructions.com/editorData/file/9810518106.pdfIn PDF document text
- http://a-pluset.com/userfiles/nepusiti.pdfIn PDF document text
- http://szermgrt.hu/uploads/ckfinder/userfiles/files/40834545483.pdfIn PDF document text
- https://27061010.com/uploads/files/202109140033283120.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kio2827lb3ish9rttut3h765s7/susatozegesexad.pdfIn PDF document text
- http://asiadomainstore.com/userfiles/file/99763754380.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/54bb5b7639c6a9bceb48b79a9eb2e95a/22180983810.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143ead0c9233---728132327.pdfIn PDF document text
- http://blbr365.com/userfiles/file/1630578609.pdfIn PDF document text
- https://mlmrockstars.com/ckfinder/userfiles/files/xewojogepepinifavab.pdfIn PDF document text
- http://cisseo.net/userfiles/files/kinif.pdfIn PDF document text
- http://tuanlongland.com/upload/files/gibusukob.pdfIn PDF document text
- http://paykaaluminiya.ru/ckfinder/userfiles/files/97133374741.pdfIn PDF document text
- http://faradtvandor.hu/picture/userfiles/file/rujogesizajuzafiv.pdfIn PDF document text
- https://melz-feu.ru/upload/wozilun.pdfIn PDF document text
- https://fertilizerproductionprocess.com/d/files/bixazutumegufilepubimito.pdfIn PDF document text
- https://ontogepszerviz.hu/editor_up/poxego.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab5e4c455---fulipokimexuwez.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_off0000dcf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCF3	16560 bytes
SHA-256: `52eae442701f0d9daad10851f5533d394c59ed69b84be76e8725c3b354374df6`
`font_01_sfnt_off000107d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107D5	10824 bytes
SHA-256: `611f77b8c13a1baea89908feacc269ddad1a86300a1a004aa9ce27c80d3073d8`
`font_02_sfnt_off000120a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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