PDF malware analysis — malicious · 1b2780e1e5eee189

MALICIOUS

PDF

96.6 KB Created: 2021-09-19 22:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 47eeaa502fdd6642abf0aea1f473e318 SHA-1: 4e0e45620bb545a3814d66de603d789faa83007c SHA-256: 1b2780e1e5eee18919a03f0abd0577f2332da9fca3e7da6d9606239072119779

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing or malware distribution sites, indicating a phishing or downloader attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ef0b1445468497ebea6069107dd5b9f/3736463240.pdf In PDF document text
- http://cyuanmei.com/userfiles/file/foxemotusuvijanum.pdfIn PDF document text
- https://albawadiroad.com/userfiles/files/5282140952.pdfIn PDF document text
- https://brtim.com/uploads/wysiwyg/files/40879482320.pdfIn PDF document text
- https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/dosixasunoluvugasenes.pdfIn PDF document text
- http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/59924352960.pdfIn PDF document text
- http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/70483662152.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f63d8125a---roxatemusowunoferiraz.pdfIn PDF document text
- https://butterfly-propertymanagement.com/userfiles/file/18669569754.pdfIn PDF document text
- http://celcg.pl/uploaded/file/tudugosipunijasopu.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6b5e5d5884d69451bddc8a42f05d65f3/81147184059.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f76e326c---gozifasi.pdfIn PDF document text
- http://yoshitomo-kokubunji.com/jcfiles/file/narok.pdfIn PDF document text
- http://manpukulivermore.com/uploads/files/61029075158.pdfIn PDF document text
- http://monarchiaerembolt.hu/tmp/22270585487.pdfIn PDF document text
- https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/82315068090.pdfIn PDF document text
- https://0922.sproname.com/files/userfiles/files/kuxubogukedobufalub.pdfIn PDF document text
- http://intimatehotelpattaya.com/image/upload/File/takipojobimufidikinivo.pdfIn PDF document text
- https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/dawaxagege.pdfIn PDF document text
- http://artepcb.com/upload/files/23930910464.pdfIn PDF document text
- http://jongauger.com/userfiles/file/83258228368.pdfIn PDF document text
- https://darshanam.com/ckfinder/userfiles/files/sezorepewi.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/77686193697.pdfIn PDF document text
- http://originalavto.ru/userfiles/file/moxezebugow.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614633bde6958---55146468576.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sync+google+tasks+with+android+appPDF 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_off000111ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111AB	11160 bytes
SHA-256: `763bf45c329ca34a89f90261dae1e87034b3286dda94d18147a4187037737b51`
`font_01_sfnt_off00012b94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B94	18848 bytes
SHA-256: `f0961fdc0deaa9b599116d196229d7c8f93b836f7a36a6b30fd735fa2d17cefd`
`font_02_sfnt_off00015c58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15C58	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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